{
 "what": "The presenter's field-loss figures against IGRF-14 and CHAOS-8 (factchecked.science, Our analysis)",
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  "WMM2025COF.zip": "999080a12c95122c2031aeac8be77229d97584530e87e0f1a6df7d946ecf90c5",
  "COV-OBS.x2-int": "6c588becf4e3896b07be80c3f24697d299432120a7f4ab1139a914395f9d2a17",
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   "per_decade_pct": 0.667,
   "per_century_pct": 6.67,
   "1859_to_2000_per_decade_pct": 0.709
  },
  "5% per century": {
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  "5% per decade (from 2006 or 2010)": {
   "per_century_pct_linear": 50.0,
   "ratio_to_5_per_century": 10.0
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  "10% in 20 years": {
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  },
  "8% in 11 years (2014-2025)": {
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   "per_century_pct": 72.73,
   "his_inputs_give_loss_2025_pct": {
    "15% (2010) + 5%/decade to 2014 + 8% (2014-2025)": 25.0,
    "15% (2010) + 8%/11 years for 2010-2025": 25.91
   },
   "he_says_2025_pct": 30
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  "30% since the 1800s, half in the last two decades": {
   "last_two_decades_per_decade_pct": 7.5,
   "earlier_15pct_over_1850_2005_per_decade_pct": 0.968
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  "55% since the 1600s (1 to 0.45)": {
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   "per_century_pct_if_since_1675": 15.71,
   "field_then_relative_to_now": 2.222
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  "projections on his own rates (straight lines)": {
   "his 2010 figures: 15% lost by 2010, then 5% per decade": {
    "loss_in_2026_pct": 23.0,
    "loss_in_2045_pct": 32.5,
    "half_gone_year": 2080.0,
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   "his 2025 figures: 30% lost by 2025, then 8% per 11 years": {
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    "loss_in_2045_pct": 44.5,
    "half_gone_year": 2052.5,
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   "his Dec 2025 figures: 30% by 2025, then 7.5% per decade": {
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    "loss_in_2045_pct": 45.0,
    "half_gone_year": 2051.7,
    "all_gone_year": 2118.3
   }
  },
  "what the 2040s would need, from his 30% in 2025": {
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    "to_zero_pct_points_per_decade": 46.7,
    "to_half_of_1850s_pct_points_per_decade": 13.3
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    "to_half_of_1850s_pct_points_per_decade": 10.0
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    "to_zero_pct_points_per_decade": 29.2,
    "to_half_of_1850s_pct_points_per_decade": 8.3
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   "end": 29352.11046,
   "change_pct": -0.685,
   "per_decade_pct": -0.343,
   "at_5pct_per_decade_end_would_be": 26599.1177,
   "compounding": 26673.0042,
   "at_5pct_per_decade_change_pct": -10.0,
   "measured_as_share_of_5pct_per_decade": 0.0685
  },
  "CHAOS-8.5 2014.0-2025.0 M": {
   "from": 2014.0,
   "to": 2025.0,
   "start": 7.7282,
   "end": 7.6901,
   "change_pct": -0.493,
   "per_decade_pct": -0.448,
   "at_5pct_per_decade_end_would_be": 7.3031,
   "compounding": 7.3042,
   "at_5pct_per_decade_change_pct": -5.5,
   "measured_as_share_of_5pct_per_decade": 0.0896
  },
  "CHAOS-8.5 2014.0-2025.0 |g10|": {
   "from": 2014.0,
   "to": 2025.0,
   "start": 29451.39408,
   "end": 29351.56604,
   "change_pct": -0.339,
   "per_decade_pct": -0.308,
   "at_5pct_per_decade_end_would_be": 27831.5674,
   "compounding": 27835.6792,
   "at_5pct_per_decade_change_pct": -5.5,
   "measured_as_share_of_5pct_per_decade": 0.0616
  },
  "CHAOS-8.5 2014.0-2026.0 M": {
   "from": 2014.0,
   "to": 2026.0,
   "start": 7.7282,
   "end": 7.68596,
   "change_pct": -0.547,
   "per_decade_pct": -0.455,
   "at_5pct_per_decade_end_would_be": 7.2645,
   "compounding": 7.2669,
   "at_5pct_per_decade_change_pct": -6.0,
   "measured_as_share_of_5pct_per_decade": 0.0911
  },
  "CHAOS-8.5 2014.0-2026.0 |g10|": {
   "from": 2014.0,
   "to": 2026.0,
   "start": 29451.39408,
   "end": 29338.75892,
   "change_pct": -0.382,
   "per_decade_pct": -0.319,
   "at_5pct_per_decade_end_would_be": 27684.3104,
   "compounding": 27693.2664,
   "at_5pct_per_decade_change_pct": -6.0,
   "measured_as_share_of_5pct_per_decade": 0.0637
  },
  "CHAOS-8.5 2014.0-2024.0 M": {
   "from": 2014.0,
   "to": 2024.0,
   "start": 7.7282,
   "end": 7.69408,
   "change_pct": -0.441,
   "per_decade_pct": -0.441,
   "at_5pct_per_decade_end_would_be": 7.3418,
   "compounding": 7.3418,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.0883
  },
  "CHAOS-8.5 2014.0-2024.0 |g10|": {
   "from": 2014.0,
   "to": 2024.0,
   "start": 29451.39408,
   "end": 29363.43736,
   "change_pct": -0.299,
   "per_decade_pct": -0.299,
   "at_5pct_per_decade_end_would_be": 27978.8244,
   "compounding": 27978.8244,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.0597
  },
  "CHAOS-8.5 2015.0-2025.0 M": {
   "from": 2015.0,
   "to": 2025.0,
   "start": 7.72423,
   "end": 7.6901,
   "change_pct": -0.442,
   "per_decade_pct": -0.442,
   "at_5pct_per_decade_end_would_be": 7.338,
   "compounding": 7.338,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.0884
  },
  "CHAOS-8.5 2015.0-2025.0 |g10|": {
   "from": 2015.0,
   "to": 2025.0,
   "start": 29441.06737,
   "end": 29351.56604,
   "change_pct": -0.304,
   "per_decade_pct": -0.304,
   "at_5pct_per_decade_end_would_be": 27969.014,
   "compounding": 27969.014,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.0608
  },
  "CHAOS-8.5 2000.0-2010.0 M": {
   "from": 2000.0,
   "to": 2010.0,
   "start": 7.78868,
   "end": 7.74533,
   "change_pct": -0.557,
   "per_decade_pct": -0.557,
   "at_5pct_per_decade_end_would_be": 7.3992,
   "compounding": 7.3992,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.1113
  },
  "CHAOS-8.5 2000.0-2010.0 |g10|": {
   "from": 2000.0,
   "to": 2010.0,
   "start": 29615.88655,
   "end": 29494.94259,
   "change_pct": -0.408,
   "per_decade_pct": -0.408,
   "at_5pct_per_decade_end_would_be": 28135.0922,
   "compounding": 28135.0922,
   "at_5pct_per_decade_change_pct": -5.0,
   "measured_as_share_of_5pct_per_decade": 0.0817
  },
  "CHAOS-8.5 2005.0-2025.0 M": {
   "from": 2005.0,
   "to": 2025.0,
   "start": 7.76734,
   "end": 7.6901,
   "change_pct": -0.994,
   "per_decade_pct": -0.497,
   "at_5pct_per_decade_end_would_be": 6.9906,
   "compounding": 7.01,
   "at_5pct_per_decade_change_pct": -10.0,
   "measured_as_share_of_5pct_per_decade": 0.0994
  },
  "CHAOS-8.5 2005.0-2025.0 |g10|": {
   "from": 2005.0,
   "to": 2025.0,
   "start": 29554.13936,
   "end": 29351.56604,
   "change_pct": -0.685,
   "per_decade_pct": -0.343,
   "at_5pct_per_decade_end_would_be": 26598.7254,
   "compounding": 26672.6108,
   "at_5pct_per_decade_change_pct": -10.0,
   "measured_as_share_of_5pct_per_decade": 0.0685
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 },
 "E_forecasts": {
  "IGRF-14 M 2025 -> 2030": [
   7.68967,
   7.66877
  ],
  "IGRF-14 M 2025-2030 per decade pct": -0.544,
  "IGRF-14 |g10| 2025-2030 nT per yr": 12.6,
  "WMM2025 M 2025 -> 2030": [
   7.6901,
   7.67
  ],
  "WMM2025 M per decade pct": -0.523,
  "halving the axial dipole from 2025 by": {
   "2040": {
    "nT_per_yr": 978.3,
    "times_IGRF14_forecast": 77.6,
    "pct_of_2025_per_decade": 33.3
   },
   "2045": {
    "nT_per_yr": 733.8,
    "times_IGRF14_forecast": 58.2,
    "pct_of_2025_per_decade": 25.0
   },
   "2049": {
    "nT_per_yr": 611.5,
    "times_IGRF14_forecast": 48.5,
    "pct_of_2025_per_decade": 20.8
   }
  }
 },
 "C_surface_IGRF14_2014_2025": {
  "label": "IGRF-14",
  "from": 2014.0,
  "to": 2025.0,
  "global_mean_F_nT": [
   42362.5,
   42201.9
  ],
  "global_mean_change_pct": -0.379,
  "global_mean_change_pct_per_decade": -0.345,
  "largest_local_loss_pct": [
   -3.812,
   -36.5,
   2.5
  ],
  "largest_local_loss_pct_per_decade": -3.465,
  "largest_local_gain_pct": [
   3.104,
   -27.5,
   52.5
  ],
  "largest_local_loss_nT": [
   -1322.5,
   32.5,
   -85.5
  ],
  "share_of_surface_pct": {
   "lost at least 5.0% per decade": 0.0,
   "lost at least 2.5% per decade": 6.0977,
   "lost at least 1.0% per decade": 35.6631
  },
  "share_of_surface_gaining_pct": 41.86,
  "americas_box_mean_change_pct": -1.756,
  "americas_box_largest_loss_pct": [
   -3.175,
   2.5,
   -74.5
  ],
  "regions": {
   "Canada strong-field maximum": {
    "F_2014.0": 59108.3,
    "at_2014.0": [
     61.85,
     -100.6
    ],
    "F_2025.0": 58303.8,
    "at_2025.0": [
     63.05,
     -98.3
    ],
    "change_nT": -804.5,
    "change_pct": -1.361
   },
   "Siberia strong-field maximum": {
    "F_2014.0": 61657.6,
    "at_2014.0": [
     61.65,
     103.45
    ],
    "F_2025.0": 61910.4,
    "at_2025.0": [
     61.55,
     101.65
    ],
    "change_nT": 252.7,
    "change_pct": 0.41
   },
   "South Atlantic Anomaly minimum": {
    "F_2014.0": 22412.7,
    "at_2014.0": [
     -26.3,
     -57.55
    ],
    "F_2025.0": 22071.4,
    "at_2025.0": [
     -26.2,
     -60.05
    ],
    "change_nT": -341.3,
    "change_pct": -1.523
   },
   "Southern strong-field maximum": {
    "F_2014.0": 66993.2,
    "at_2014.0": [
     -60.4,
     136.7
    ],
    "F_2025.0": 66952.9,
    "at_2025.0": [
     -59.75,
     134.6
    ],
    "change_nT": -40.4,
    "change_pct": -0.06
   }
  }
 },
 "C_surface_CHAOS87_2014_2026": {
  "label": "CHAOS-8.7, degree 13",
  "from": 2014.0,
  "to": 2026.0,
  "global_mean_F_nT": [
   42361.1,
   42185.8
  ],
  "global_mean_change_pct": -0.414,
  "global_mean_change_pct_per_decade": -0.345,
  "largest_local_loss_pct": [
   -4.221,
   -35.5,
   2.5
  ],
  "largest_local_loss_pct_per_decade": -3.517,
  "largest_local_gain_pct": [
   3.405,
   -27.5,
   52.5
  ],
  "largest_local_loss_nT": [
   -1437.0,
   33.5,
   -86.5
  ],
  "share_of_surface_pct": {
   "lost at least 5.0% per decade": 0.0,
   "lost at least 2.5% per decade": 5.7997,
   "lost at least 1.0% per decade": 35.7848
  },
  "share_of_surface_gaining_pct": 41.83,
  "americas_box_mean_change_pct": -1.908,
  "americas_box_largest_loss_pct": [
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   2.5,
   -74.5
  ],
  "regions": {
   "Canada strong-field maximum": {
    "F_2014.0": 59110.0,
    "at_2014.0": [
     61.85,
     -100.7
    ],
    "F_2026.0": 58247.0,
    "at_2026.0": [
     63.2,
     -98.15
    ],
    "change_nT": -863.0,
    "change_pct": -1.46
   },
   "Siberia strong-field maximum": {
    "F_2014.0": 61657.6,
    "at_2014.0": [
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     103.45
    ],
    "F_2026.0": 61947.2,
    "at_2026.0": [
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     101.55
    ],
    "change_nT": 289.6,
    "change_pct": 0.47
   },
   "South Atlantic Anomaly minimum": {
    "F_2014.0": 22409.4,
    "at_2014.0": [
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     -57.5
    ],
    "F_2026.0": 22039.9,
    "at_2026.0": [
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     -60.2
    ],
    "change_nT": -369.6,
    "change_pct": -1.649
   },
   "Southern strong-field maximum": {
    "F_2014.0": 66995.2,
    "at_2014.0": [
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     136.7
    ],
    "F_2026.0": 66932.4,
    "at_2026.0": [
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     134.45
    ],
    "change_nT": -62.8,
    "change_pct": -0.094
   }
  }
 },
 "C_surface_CHAOS87_2014_2025": {
  "label": "CHAOS-8.7, degree 13",
  "from": 2014.0,
  "to": 2025.0,
  "global_mean_F_nT": [
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   42205.0
  ],
  "global_mean_change_pct": -0.368,
  "global_mean_change_pct_per_decade": -0.335,
  "largest_local_loss_pct": [
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   -35.5,
   2.5
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  "largest_local_loss_pct_per_decade": -3.459,
  "largest_local_gain_pct": [
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   -27.5,
   52.5
  ],
  "largest_local_loss_nT": [
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   32.5,
   -85.5
  ],
  "share_of_surface_pct": {
   "lost at least 5.0% per decade": 0.0,
   "lost at least 2.5% per decade": 5.8378,
   "lost at least 1.0% per decade": 35.5689
  },
  "share_of_surface_gaining_pct": 42.29,
  "americas_box_mean_change_pct": -1.743,
  "americas_box_largest_loss_pct": [
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   0.5,
   -75.5
  ],
  "regions": {
   "Canada strong-field maximum": {
    "F_2014.0": 59110.0,
    "at_2014.0": [
     61.85,
     -100.7
    ],
    "F_2025.0": 58316.3,
    "at_2025.0": [
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     -98.3
    ],
    "change_nT": -793.7,
    "change_pct": -1.343
   },
   "Siberia strong-field maximum": {
    "F_2014.0": 61657.6,
    "at_2014.0": [
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     103.45
    ],
    "F_2025.0": 61914.2,
    "at_2025.0": [
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     101.65
    ],
    "change_nT": 256.7,
    "change_pct": 0.416
   },
   "South Atlantic Anomaly minimum": {
    "F_2014.0": 22409.4,
    "at_2014.0": [
     -26.3,
     -57.5
    ],
    "F_2025.0": 22072.3,
    "at_2025.0": [
     -26.2,
     -60.05
    ],
    "change_nT": -337.1,
    "change_pct": -1.504
   },
   "Southern strong-field maximum": {
    "F_2014.0": 66995.2,
    "at_2014.0": [
     -60.4,
     136.7
    ],
    "F_2025.0": 66953.4,
    "at_2025.0": [
     -59.7,
     134.6
    ],
    "change_nT": -41.8,
    "change_pct": -0.062
   }
  }
 },
 "D_rates_IGRF14_2014.5": {
  "label": "IGRF-14, 2010-15 secular variation, at 2014.5",
  "fastest_relative_fall_pct_per_decade": -3.181,
  "at": [
   -2.5,
   -74.5
  ],
  "there_dFdt_nT_per_yr": -88.7,
  "there_F_nT": 27875.3,
  "fastest_fall_nT_per_yr": -129.2,
  "fastest_fall_at": [
   32.5,
   -81.5
  ],
  "fastest_fall_there_pct_per_decade": -2.661,
  "share_of_surface_pct": {
   "falling at least 5% per decade": 0.0,
   "falling at least 3% per decade": 1.6833,
   "falling at least 2% per decade": 16.9437
  },
  "global_mean_dFdt_nT_per_yr": -17.58
 },
 "D_rates_CHAOS87_2014.5": {
  "label": "CHAOS-8.7 at 2014.5",
  "fastest_relative_fall_pct_per_decade": -3.31,
  "at": [
   -4.5,
   -74.5
  ],
  "there_dFdt_nT_per_yr": -89.8,
  "there_F_nT": 27132.1,
  "fastest_fall_nT_per_yr": -120.0,
  "fastest_fall_at": [
   34.5,
   -82.5
  ],
  "fastest_fall_there_pct_per_decade": -2.408,
  "share_of_surface_pct": {
   "falling at least 5% per decade": 0.0,
   "falling at least 3% per decade": 1.3616,
   "falling at least 2% per decade": 15.1567
  },
  "global_mean_dFdt_nT_per_yr": -15.83
 },
 "D_rates_CHAOS87_2026.0": {
  "label": "CHAOS-8.7 at 2026.0",
  "fastest_relative_fall_pct_per_decade": -4.457,
  "at": [
   -32.5,
   0.5
  ],
  "there_dFdt_nT_per_yr": -108.3,
  "there_F_nT": 24296.8,
  "fastest_fall_nT_per_yr": -128.7,
  "fastest_fall_at": [
   35.5,
   -91.5
  ],
  "fastest_fall_there_pct_per_decade": -2.6,
  "share_of_surface_pct": {
   "falling at least 5% per decade": 0.0,
   "falling at least 3% per decade": 1.7501,
   "falling at least 2% per decade": 17.5832
  },
  "global_mean_dFdt_nT_per_yr": -19.77
 },
 "D_rates_IGRF14_2025_2030": {
  "label": "IGRF-14 forecast for 2025-30, at 2025.0",
  "fastest_relative_fall_pct_per_decade": -3.988,
  "at": [
   -34.5,
   0.5
  ],
  "there_dFdt_nT_per_yr": -95.8,
  "there_F_nT": 24013.1,
  "fastest_fall_nT_per_yr": -128.3,
  "fastest_fall_at": [
   34.5,
   -91.5
  ],
  "fastest_fall_there_pct_per_decade": -2.616,
  "share_of_surface_pct": {
   "falling at least 5% per decade": 0.0,
   "falling at least 3% per decade": 1.3715,
   "falling at least 2% per decade": 17.9316
  },
  "global_mean_dFdt_nT_per_yr": -19.69
 },
 "D_six_months_2014_CHAOS87": {
  "span": [
   2014.0,
   2014.4959
  ],
  "largest_fall_nT": -60.0,
  "fall_at": [
   34.5,
   -82.5
  ],
  "fall_there_F_nT": 49900.6,
  "largest_rise_nT": 52.3,
  "rise_at": [
   -28.5,
   58.5
  ],
  "largest_relative_fall_pct": -0.1638,
  "rel_fall_at": [
   -5.5,
   -74.5
  ],
  "largest_relative_fall_as_pct_per_decade": -3.304,
  "largest_fall_as_nT_per_yr": -120.9
 },
 "C_saa_areas": {
  "IGRF-14 2014.0 -> IGRF-14 2025.0": {
   "26000": {
    "pct_of_Earth": [
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     7.725
    ],
    "relative_growth_pct": 13.7
   },
   "25000": {
    "pct_of_Earth": [
     4.717,
     5.825
    ],
    "relative_growth_pct": 23.5
   },
   "24000": {
    "pct_of_Earth": [
     2.188,
     3.61
    ],
    "relative_growth_pct": 65.0
   },
   "23000": {
    "pct_of_Earth": [
     0.738,
     1.21
    ],
    "relative_growth_pct": 64.0
   }
  },
  "CHAOS-8.7 2014.0 -> CHAOS-8.7 2026.0": {
   "26000": {
    "pct_of_Earth": [
     6.794,
     7.806
    ],
    "relative_growth_pct": 14.9
   },
   "25000": {
    "pct_of_Earth": [
     4.718,
     5.936
    ],
    "relative_growth_pct": 25.8
   },
   "24000": {
    "pct_of_Earth": [
     2.19,
     3.784
    ],
    "relative_growth_pct": 72.8
   },
   "23000": {
    "pct_of_Earth": [
     0.744,
     1.257
    ],
    "relative_growth_pct": 69.0
   }
  }
 },
 "D_yearly_dipole_paces_CHAOS87": [
  {
   "year": 1999.5,
   "M_pct_per_century_weakening": 6.02,
   "g10_nT_per_yr_weakening": 13.89
  },
  {
   "year": 2000.5,
   "M_pct_per_century_weakening": 6.13,
   "g10_nT_per_yr_weakening": 14.3
  },
  {
   "year": 2001.5,
   "M_pct_per_century_weakening": 5.43,
   "g10_nT_per_yr_weakening": 12.33
  },
  {
   "year": 2002.5,
   "M_pct_per_century_weakening": 5.32,
   "g10_nT_per_yr_weakening": 12.0
  },
  {
   "year": 2003.5,
   "M_pct_per_century_weakening": 4.91,
   "g10_nT_per_yr_weakening": 10.56
  },
  {
   "year": 2004.5,
   "M_pct_per_century_weakening": 5.74,
   "g10_nT_per_yr_weakening": 12.84
  },
  {
   "year": 2005.5,
   "M_pct_per_century_weakening": 5.74,
   "g10_nT_per_yr_weakening": 12.73
  },
  {
   "year": 2006.5,
   "M_pct_per_century_weakening": 5.91,
   "g10_nT_per_yr_weakening": 12.94
  },
  {
   "year": 2007.5,
   "M_pct_per_century_weakening": 5.42,
   "g10_nT_per_yr_weakening": 11.07
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  {
   "year": 2008.5,
   "M_pct_per_century_weakening": 5.55,
   "g10_nT_per_yr_weakening": 11.12
  },
  {
   "year": 2009.5,
   "M_pct_per_century_weakening": 5.78,
   "g10_nT_per_yr_weakening": 11.4
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  {
   "year": 2010.5,
   "M_pct_per_century_weakening": 5.41,
   "g10_nT_per_yr_weakening": 10.4
  },
  {
   "year": 2011.5,
   "M_pct_per_century_weakening": 5.44,
   "g10_nT_per_yr_weakening": 10.48
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  {
   "year": 2012.5,
   "M_pct_per_century_weakening": 5.67,
   "g10_nT_per_yr_weakening": 11.18
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  {
   "year": 2013.5,
   "M_pct_per_century_weakening": 5.6,
   "g10_nT_per_yr_weakening": 11.4
  },
  {
   "year": 2014.5,
   "M_pct_per_century_weakening": 5.14,
   "g10_nT_per_yr_weakening": 10.37
  },
  {
   "year": 2015.5,
   "M_pct_per_century_weakening": 4.64,
   "g10_nT_per_yr_weakening": 8.59
  },
  {
   "year": 2016.5,
   "M_pct_per_century_weakening": 4.63,
   "g10_nT_per_yr_weakening": 8.5
  },
  {
   "year": 2017.5,
   "M_pct_per_century_weakening": 4.2,
   "g10_nT_per_yr_weakening": 7.34
  },
  {
   "year": 2018.5,
   "M_pct_per_century_weakening": 3.74,
   "g10_nT_per_yr_weakening": 6.43
  },
  {
   "year": 2019.5,
   "M_pct_per_century_weakening": 3.83,
   "g10_nT_per_yr_weakening": 7.28
  },
  {
   "year": 2020.5,
   "M_pct_per_century_weakening": 4.0,
   "g10_nT_per_yr_weakening": 8.4
  },
  {
   "year": 2021.5,
   "M_pct_per_century_weakening": 4.0,
   "g10_nT_per_yr_weakening": 8.43
  },
  {
   "year": 2022.5,
   "M_pct_per_century_weakening": 4.68,
   "g10_nT_per_yr_weakening": 10.26
  },
  {
   "year": 2023.5,
   "M_pct_per_century_weakening": 5.44,
   "g10_nT_per_yr_weakening": 12.51
  },
  {
   "year": 2024.5,
   "M_pct_per_century_weakening": 5.04,
   "g10_nT_per_yr_weakening": 11.51
  },
  {
   "year": 2025.5,
   "M_pct_per_century_weakening": 5.39,
   "g10_nT_per_yr_weakening": 12.79
  },
  {
   "year": 2026.5,
   "M_pct_per_century_weakening": 5.14,
   "g10_nT_per_yr_weakening": 12.11
  }
 ],
 "site_AV43": {
  "lat_lon": [
   -74.141,
   166.083
  ],
  "series": [
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    "year": 1840.0,
    "COV-OBS.x2": 69187.6
   },
   {
    "year": 1850.0,
    "COV-OBS.x2": 69418.3
   },
   {
    "year": 1860.0,
    "COV-OBS.x2": 69690.6
   },
   {
    "year": 1870.0,
    "COV-OBS.x2": 69497.6
   },
   {
    "year": 1880.0,
    "COV-OBS.x2": 69172.1
   },
   {
    "year": 1890.0,
    "COV-OBS.x2": 68957.3
   },
   {
    "year": 1900.0,
    "COV-OBS.x2": 68788.7,
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   },
   {
    "year": 1910.0,
    "COV-OBS.x2": 68646.1,
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   },
   {
    "year": 1920.0,
    "COV-OBS.x2": 68454.9,
    "IGRF-14": 68660.8
   },
   {
    "year": 1930.0,
    "COV-OBS.x2": 68255.9,
    "IGRF-14": 68260.9
   },
   {
    "year": 1940.0,
    "COV-OBS.x2": 68022.1,
    "IGRF-14": 67908.1
   },
   {
    "year": 1950.0,
    "COV-OBS.x2": 67685.7,
    "IGRF-14": 68119.8
   },
   {
    "year": 1960.0,
    "COV-OBS.x2": 67008.1,
    "IGRF-14": 67008.4
   },
   {
    "year": 1970.0,
    "COV-OBS.x2": 66256.2,
    "IGRF-14": 66291.8
   },
   {
    "year": 1980.0,
    "COV-OBS.x2": 65541.7,
    "IGRF-14": 65558.9
   },
   {
    "year": 1990.0,
    "COV-OBS.x2": 64967.0,
    "IGRF-14": 64952.6
   },
   {
    "year": 2000.0,
    "COV-OBS.x2": 64587.9,
    "IGRF-14": 64585.8
   },
   {
    "year": 2010.0,
    "COV-OBS.x2": 64139.9,
    "IGRF-14": 64128.2
   },
   {
    "year": 2020.0,
    "COV-OBS.x2": 63681.0,
    "IGRF-14": 63685.7
   },
   {
    "year": 2014.0,
    "COV-OBS.x2": 63971.1,
    "IGRF-14": 63958.4
   },
   {
    "year": 2025.0,
    "IGRF-14": 63417.2
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  ],
  "COV-OBS.x2 1840->2000 pct": -6.65,
  "COV-OBS.x2 1840->2020 pct": -7.96,
  "IGRF-14 1900->2025 pct": -8.55,
  "COV-OBS.x2 dipole M 1840, 2000": [
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   7.79
  ],
  "COV-OBS.x2 |g10| 1840 -> 2000 pct": -8.06,
  "COV-OBS.x2 valid span": [
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   2022.0
  ]
 },
 "measured_loss_since_start_dates_COVOBSx2": {
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   "absg10_start_nT": 32217.4,
   "M_change_to_2000_pct": -8.29,
   "M_change_to_2010_pct": -8.81,
   "M_change_to_2025_pct (IGRF-14 end)": -9.47,
   "absg10_change_to_2000_pct": -8.06,
   "absg10_change_to_2010_pct": -8.44,
   "absg10_change_to_2025_pct (IGRF-14 end)": -8.9
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  "1850.0": {
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   "absg10_start_nT": 32173.0,
   "M_change_to_2000_pct": -8.19,
   "M_change_to_2010_pct": -8.71,
   "M_change_to_2025_pct (IGRF-14 end)": -9.37,
   "absg10_change_to_2000_pct": -7.93,
   "absg10_change_to_2010_pct": -8.31,
   "absg10_change_to_2025_pct (IGRF-14 end)": -8.77
  },
  "1859.0": {
   "M_start": 8.493,
   "absg10_start_nT": 32196.4,
   "M_change_to_2000_pct": -8.28,
   "M_change_to_2010_pct": -8.79,
   "M_change_to_2025_pct (IGRF-14 end)": -9.46,
   "absg10_change_to_2000_pct": -8.0,
   "absg10_change_to_2010_pct": -8.38,
   "absg10_change_to_2025_pct (IGRF-14 end)": -8.84
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 },
 "average_surface_field_since_1840": {
  "1840.0": 45991.3,
  "1850.0": 45934.2,
  "1859.0": 45983.9,
  "2000.0": 42634.1,
  "2020.0": 42287.1,
  "2025.0 (IGRF-14)": 42201.9,
  "change_1840_2025_pct": -8.24,
  "change_1859_2025_pct": -8.22,
  "change_2000_2025_pct": -1.01
 },
 "paces_for_comparison": {
  "IGRF-14 five-year paces of M, % per century": [
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    "span": "1900-1905",
    "M_pct_per_century_weakening": 4.96
   },
   {
    "span": "1905-1910",
    "M_pct_per_century_weakening": 6.85
   },
   {
    "span": "1910-1915",
    "M_pct_per_century_weakening": 8.93
   },
   {
    "span": "1915-1920",
    "M_pct_per_century_weakening": 9.65
   },
   {
    "span": "1920-1925",
    "M_pct_per_century_weakening": 8.61
   },
   {
    "span": "1925-1930",
    "M_pct_per_century_weakening": 7.63
   },
   {
    "span": "1930-1935",
    "M_pct_per_century_weakening": 5.61
   },
   {
    "span": "1935-1940",
    "M_pct_per_century_weakening": 3.77
   },
   {
    "span": "1940-1945",
    "M_pct_per_century_weakening": 3.92
   },
   {
    "span": "1945-1950",
    "M_pct_per_century_weakening": 2.61
   },
   {
    "span": "1950-1955",
    "M_pct_per_century_weakening": 3.49
   },
   {
    "span": "1955-1960",
    "M_pct_per_century_weakening": 5.53
   },
   {
    "span": "1960-1965",
    "M_pct_per_century_weakening": 5.9
   },
   {
    "span": "1965-1970",
    "M_pct_per_century_weakening": 7.91
   },
   {
    "span": "1970-1975",
    "M_pct_per_century_weakening": 8.62
   },
   {
    "span": "1975-1980",
    "M_pct_per_century_weakening": 7.99
   },
   {
    "span": "1980-1985",
    "M_pct_per_century_weakening": 9.09
   },
   {
    "span": "1985-1990",
    "M_pct_per_century_weakening": 7.66
   },
   {
    "span": "1990-1995",
    "M_pct_per_century_weakening": 6.8
   },
   {
    "span": "1995-2000",
    "M_pct_per_century_weakening": 6.32
   },
   {
    "span": "2000-2005",
    "M_pct_per_century_weakening": 5.68
   },
   {
    "span": "2005-2010",
    "M_pct_per_century_weakening": 5.59
   },
   {
    "span": "2010-2015",
    "M_pct_per_century_weakening": 5.53
   },
   {
    "span": "2015-2020",
    "M_pct_per_century_weakening": 4.19
   },
   {
    "span": "2020-2025",
    "M_pct_per_century_weakening": 4.79
   },
   {
    "span": "2025-2030",
    "M_pct_per_century_weakening": 5.43
   }
  ],
  "fastest five-year pace 1945-2025": {
   "span": "1980-1985",
   "M_pct_per_century_weakening": 9.09
  },
  "COV-OBS.x2 M 1840-2010 average, % per century": 5.18,
  "CHAOS-8.7 mean yearly pace 2000.5-2013.5": 5.58,
  "CHAOS-8.7 mean yearly pace 2014.5-2025.5": 4.56
 },
 "H_july_2026_and_1590": {
  "basis": "axial dipole |g10|, nT: IGRF-14 from 1900; 1840 = 2010 + 170 yr x 16 nT/yr; 1840-1900 straight; 1590-1840 at 2 nT/yr (Gubbins et al. 2006's trend, one reconstruction), as on /next-excursion/",
  "values_nT": {
   "1590": 32716.6,
   "1595": 32706.6,
   "1840": 32216.6,
   "1900": 31543.0,
   "1925": 30926.0,
   "1945": 30594.0,
   "2025": 29350.0
  },
  "loss_1945_2025_nT": 1244.0,
  "loss_1595_1945_nT": 2112.6,
  "last_80_over_350_before": 0.59,
  "loss_1925_2025_nT": 1576.0,
  "loss_1590_1925_nT": 1790.6,
  "last_100_over_335_before": 0.88,
  "1590_over_2025_on_this_series": 1.115,
  "if_16nT_per_yr_since_1590": {
   "1590_over_2025": 1.234,
   "loss_1595_1945_nT": 5542.6,
   "last_80_over_350_before": 0.22
  },
  "field_1590_needed_for_55pct_loss": 2.22
 },
 "chart_A_share_of_1850_field": {
  "measured_dipole_moment": [
   {
    "year": 1840.0,
    "pct_of_1850": 100.11,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1845.0,
    "pct_of_1850": 99.98,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1850.0,
    "pct_of_1850": 100.0,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1855.0,
    "pct_of_1850": 100.1,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1860.0,
    "pct_of_1850": 100.08,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1865.0,
    "pct_of_1850": 99.9,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1870.0,
    "pct_of_1850": 99.63,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1875.0,
    "pct_of_1850": 99.3,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1880.0,
    "pct_of_1850": 98.98,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1885.0,
    "pct_of_1850": 98.7,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1890.0,
    "pct_of_1850": 98.4,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1895.0,
    "pct_of_1850": 98.15,
    "model": "COV-OBS.x2"
   },
   {
    "year": 1900.0,
    "pct_of_1850": 98.07,
    "model": "IGRF-14"
   },
   {
    "year": 1905.0,
    "pct_of_1850": 97.83,
    "model": "IGRF-14"
   },
   {
    "year": 1910.0,
    "pct_of_1850": 97.5,
    "model": "IGRF-14"
   },
   {
    "year": 1915.0,
    "pct_of_1850": 97.06,
    "model": "IGRF-14"
   },
   {
    "year": 1920.0,
    "pct_of_1850": 96.59,
    "model": "IGRF-14"
   },
   {
    "year": 1925.0,
    "pct_of_1850": 96.18,
    "model": "IGRF-14"
   },
   {
    "year": 1930.0,
    "pct_of_1850": 95.81,
    "model": "IGRF-14"
   },
   {
    "year": 1935.0,
    "pct_of_1850": 95.54,
    "model": "IGRF-14"
   },
   {
    "year": 1940.0,
    "pct_of_1850": 95.36,
    "model": "IGRF-14"
   },
   {
    "year": 1945.0,
    "pct_of_1850": 95.17,
    "model": "IGRF-14"
   },
   {
    "year": 1950.0,
    "pct_of_1850": 95.05,
    "model": "IGRF-14"
   },
   {
    "year": 1955.0,
    "pct_of_1850": 94.88,
    "model": "IGRF-14"
   },
   {
    "year": 1960.0,
    "pct_of_1850": 94.62,
    "model": "IGRF-14"
   },
   {
    "year": 1965.0,
    "pct_of_1850": 94.34,
    "model": "IGRF-14"
   },
   {
    "year": 1970.0,
    "pct_of_1850": 93.97,
    "model": "IGRF-14"
   },
   {
    "year": 1975.0,
    "pct_of_1850": 93.56,
    "model": "IGRF-14"
   },
   {
    "year": 1980.0,
    "pct_of_1850": 93.19,
    "model": "IGRF-14"
   },
   {
    "year": 1985.0,
    "pct_of_1850": 92.77,
    "model": "IGRF-14"
   },
   {
    "year": 1990.0,
    "pct_of_1850": 92.41,
    "model": "IGRF-14"
   },
   {
    "year": 1995.0,
    "pct_of_1850": 92.1,
    "model": "IGRF-14"
   },
   {
    "year": 2000.0,
    "pct_of_1850": 91.81,
    "model": "IGRF-14"
   },
   {
    "year": 2005.0,
    "pct_of_1850": 91.54,
    "model": "IGRF-14"
   },
   {
    "year": 2010.0,
    "pct_of_1850": 91.29,
    "model": "IGRF-14"
   },
   {
    "year": 2015.0,
    "pct_of_1850": 91.04,
    "model": "IGRF-14"
   },
   {
    "year": 2020.0,
    "pct_of_1850": 90.85,
    "model": "IGRF-14"
   },
   {
    "year": 2025.0,
    "pct_of_1850": 90.63,
    "model": "IGRF-14"
   },
   {
    "year": 2030.0,
    "pct_of_1850": 90.38,
    "model": "IGRF-14 forecast"
   }
  ],
  "presenter_points": [
   {
    "year": 2000,
    "pct": 90,
    "said": "10% lost by 2000"
   },
   {
    "year": 2010,
    "pct": 85,
    "said": "15% lost by 2010"
   },
   {
    "year": 2025,
    "pct": 70,
    "said": "about 30% lost by 2025"
   }
  ],
  "presenter_lines": {
   "his 2010 pace: 5 points a decade from 85% in 2010": [
    [
     2010,
     85.0
    ],
    [
     2060,
     60.0
    ]
   ],
   "his 2025 pace: 8 points per 11 years from 70% in 2025": [
    [
     2025,
     70.0
    ],
    [
     2060,
     44.55
    ]
   ]
  },
  "M_1850_1e22_Am2": 8.4849,
  "half_of_2025_dipole_pct_of_1850": 45.31
 },
 "chart_C_antarctic_record": {
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    "year_ad": 2000.0,
    "depth_cm": 2.0,
    "rpi_scaled_to_max": 0.44,
    "share_of_1840_sample": 0.5
   },
   {
    "year_ad": 1977.1,
    "depth_cm": 3.0,
    "rpi_scaled_to_max": 0.48,
    "share_of_1840_sample": 0.545
   },
   {
    "year_ad": 1954.2,
    "depth_cm": 4.0,
    "rpi_scaled_to_max": 0.53,
    "share_of_1840_sample": 0.602
   },
   {
    "year_ad": 1931.2,
    "depth_cm": 5.0,
    "rpi_scaled_to_max": 0.6,
    "share_of_1840_sample": 0.682
   },
   {
    "year_ad": 1908.3,
    "depth_cm": 6.0,
    "rpi_scaled_to_max": 0.67,
    "share_of_1840_sample": 0.761
   },
   {
    "year_ad": 1885.4,
    "depth_cm": 7.0,
    "rpi_scaled_to_max": 0.74,
    "share_of_1840_sample": 0.841
   },
   {
    "year_ad": 1862.5,
    "depth_cm": 8.0,
    "rpi_scaled_to_max": 0.82,
    "share_of_1840_sample": 0.932
   },
   {
    "year_ad": 1839.6,
    "depth_cm": 9.0,
    "rpi_scaled_to_max": 0.88,
    "share_of_1840_sample": 1.0
   },
   {
    "year_ad": 1816.7,
    "depth_cm": 10.0,
    "rpi_scaled_to_max": 0.92,
    "share_of_1840_sample": 1.045
   },
   {
    "year_ad": 1793.8,
    "depth_cm": 11.0,
    "rpi_scaled_to_max": 0.95,
    "share_of_1840_sample": 1.08
   },
   {
    "year_ad": 1770.8,
    "depth_cm": 12.0,
    "rpi_scaled_to_max": 0.97,
    "share_of_1840_sample": 1.102
   },
   {
    "year_ad": 1747.9,
    "depth_cm": 13.0,
    "rpi_scaled_to_max": 0.99,
    "share_of_1840_sample": 1.125
   },
   {
    "year_ad": 1725.0,
    "depth_cm": 14.0,
    "rpi_scaled_to_max": 1.0,
    "share_of_1840_sample": 1.136
   }
  ],
  "av43_reference_sample": {
   "year_ad": 1839.6,
   "rpi": 0.88
  },
  "holoanta_stack_0_to_600_bp": [
   {
    "age_bp": 0.0,
    "rpi": 0.58,
    "sd": 0.12,
    "n": 6
   },
   {
    "age_bp": 200.0,
    "rpi": 0.89,
    "sd": 0.07,
    "n": 20
   },
   {
    "age_bp": 400.0,
    "rpi": 0.99,
    "sd": 0.01,
    "n": 10
   },
   {
    "age_bp": 600.0,
    "rpi": 0.96,
    "sd": 0.0,
    "n": 1
   }
  ],
  "site_field_share_of_1840": [
   {
    "year": 1840.0,
    "model": "COV-OBS.x2",
    "share": 1.0
   },
   {
    "year": 1850.0,
    "model": "COV-OBS.x2",
    "share": 1.0033
   },
   {
    "year": 1860.0,
    "model": "COV-OBS.x2",
    "share": 1.0073
   },
   {
    "year": 1870.0,
    "model": "COV-OBS.x2",
    "share": 1.0045
   },
   {
    "year": 1880.0,
    "model": "COV-OBS.x2",
    "share": 0.9998
   },
   {
    "year": 1890.0,
    "model": "COV-OBS.x2",
    "share": 0.9967
   },
   {
    "year": 1900.0,
    "model": "COV-OBS.x2",
    "share": 0.9942
   },
   {
    "year": 1910.0,
    "model": "COV-OBS.x2",
    "share": 0.9922
   },
   {
    "year": 1920.0,
    "model": "COV-OBS.x2",
    "share": 0.9894
   },
   {
    "year": 1930.0,
    "model": "COV-OBS.x2",
    "share": 0.9865
   },
   {
    "year": 1940.0,
    "model": "COV-OBS.x2",
    "share": 0.9832
   },
   {
    "year": 1950.0,
    "model": "COV-OBS.x2",
    "share": 0.9783
   },
   {
    "year": 1960.0,
    "model": "COV-OBS.x2",
    "share": 0.9685
   },
   {
    "year": 1970.0,
    "model": "COV-OBS.x2",
    "share": 0.9576
   },
   {
    "year": 1980.0,
    "model": "COV-OBS.x2",
    "share": 0.9473
   },
   {
    "year": 1990.0,
    "model": "COV-OBS.x2",
    "share": 0.939
   },
   {
    "year": 2000.0,
    "model": "COV-OBS.x2",
    "share": 0.9335
   },
   {
    "year": 2010.0,
    "model": "COV-OBS.x2",
    "share": 0.927
   },
   {
    "year": 2014.0,
    "model": "COV-OBS.x2",
    "share": 0.9246
   },
   {
    "year": 2020.0,
    "model": "COV-OBS.x2",
    "share": 0.9204
   },
   {
    "year": 2025.0,
    "model": "IGRF-14",
    "share": 0.9166
   }
  ]
 }
}