{
  "slug": "2026-09-10-magnetic-reconnection",
  "rate_geometry": {
    "optimal_opening_slope": 0.32938622045442323,
    "analytic_optimal_slope": 0.3293862216519549,
    "optimal_angle_deg": 18.231170762328468,
    "maximum_rate": 0.2011624161112965,
    "limits": "Liu2017 Eq5 from acquired arXiv1611.07859v1; low-beta symmetric nonrelativistic quasi-steady scaling. Not a universal0.2bound, not the solar/global rate, not a PIC reproduction. Sweet-Parker scaling is conditional on a laminar resistive layer; highS may be plasmoid-unstable."
  },
  "MMS2": {
    "moment_file": "mms2_fpi_brst_l2_des-moms_20161209090304_v3.4.0.cdf",
    "field_file": "mms2_fgm_brst_l2_20161209090304_v5.87.0.cdf",
    "cdflib_version": "1.3.12",
    "electron_samples": 20,
    "magnetic_samples": 77,
    "electron_flags_all_zero": true,
    "pressure_vs_nT_max_relative_difference": 7.872211896353676e-06,
    "minimum_density_time_s": 0.316643,
    "minimum_density_relative_to_first": {
      "density": 0.8350225703959305,
      "temperature": 0.9563923718757192,
      "thermal_energy_density": 0.7986091580988202
    },
    "magnetic_energy_range_nJ_m3": [
      0.5049318702275086,
      0.8181608921432081
    ],
    "guide_fraction_range": [
      0.9346340905530891,
      0.999019163514262
    ],
    "limits": "One spacecraft20native30ms moments and native128Hz B, without interpolation or time shift. Not an independent physical event or raw detector recalibration; source data product versions are pinned. Magnetic energy omits electric-field energy. Published rounded L/M directions normalized separately, no assumption of exact orthogonality. A traversed spatial feature is not the same as a parcel's temporal evolution; no J.E, four-spacecraft gradients or heat flux reconstructed."
  },
  "observer_and_energy": {
    "translation_example": "g_lab(x,t)=1+0.4exp[-(x-Ut)^2/(2w²)],U=1,w=.5; structure-frame partial derivative = fixed-position lab derivative + U·grad, exactly zero.",
    "max_finite_difference_error": 1.1776767760096618e-05,
    "ideal_work_example": {
      "chosen_velocity_m_s": 1000.0,
      "B0_T": 2e-08,
      "gradient_T_m": 2e-12,
      "interval_length_m": 10000.0,
      "incoming_Poynting_power_per_area_W_m2": 9.549296580315316e-07,
      "magnetic_energy_increase_per_area_W_m2": 4.774648290157658e-07,
      "field_work_per_area_W_m2": 4.774648290157658e-07,
      "nonideal_E_plus_u_cross_B": 0.0,
      "limits": "Instantaneous ideal-induction/Poynting counterexample, not a full MHD evolution. Positive field work is not by itself irreversible heating or changing field connectivity."
    },
    "limits": "Chosen counterexamples illustrate interpretation; they do not establish the actual MMS time evolution or prove that all observed changes are advection."
  }
}