{
 "kind": "spacecraft_particle_counts",
 "date": "2026-09-22",
 "built_utc": "2026-09-22T09:03:00+00:00",
 "rows": 47,
 "bytes": 36718,
 "sha256": "437fa81e0e9e1cf63826a4de8f80155fe649ec56bc4534f486d1bbed308b2188",
 "columns": [
  {
   "name": "slot_id",
   "dtype": "String"
  },
  {
   "name": "kind",
   "dtype": "String"
  },
  {
   "name": "name",
   "dtype": "String"
  },
  {
   "name": "start_utc",
   "dtype": "String"
  },
  {
   "name": "end_utc",
   "dtype": "String"
  },
  {
   "name": "lat",
   "dtype": "Float64"
  },
  {
   "name": "lon",
   "dtype": "Float64"
  },
  {
   "name": "n_obs",
   "dtype": "Float64"
  },
  {
   "name": "spacecraft",
   "dtype": "String"
  },
  {
   "name": "launch_utc",
   "dtype": "String"
  },
  {
   "name": "nssdca_dataset_id",
   "dtype": "String"
  },
  {
   "name": "n_readings_full",
   "dtype": "Float64"
  }
 ],
 "slot_id_column": "slot_id",
 "time_column": "start_utc",
 "sorted_by": [
  "start_utc",
  "slot_id"
 ],
 "row_groups": "one per year",
 "span": {
  "start": "1958-07-26T22:46:06+00:00",
  "end": "1968-10-08T10:11:48+00:00"
 },
 "source_file": "platform_storehouse/spacecraft_particle_counts/_manifest.parquet",
 "url": "https://data.terrapulse.info/dex/spacecraft_particle_counts/2026-09-22.parquet",
 "latest_url": "https://data.terrapulse.info/dex/spacecraft_particle_counts/latest.parquet",
 "family": "movingplatformdex",
 "storage": "dossier",
 "n_slots_api": 47,
 "sources": [
  "spdf_explorer4_cpd",
  "spdf_explorer7",
  "spdf_injun1",
  "spdf_telstar1",
  "spdf_telstar2",
  "spdf_relay1",
  "spdf_injun3",
  "spdf_transit5e1",
  "spdf_ogo1_cr",
  "spdf_explorer21_cr",
  "spdf_explorer21_ic",
  "spdf_injun4",
  "spdf_mariner4_cr",
  "spdf_explorer26_ssd",
  "spdf_explorer26_mcilwain",
  "spdf_explorer28_cr",
  "spdf_explorer28_ic",
  "spdf_zond3_ks18",
  "spdf_venera2_ks18m",
  "spdf_venera3_ks18m",
  "spdf_venera4_ks2m",
  "spdf_alouette2_epd",
  "spdf_pioneer6_crt",
  "spdf_ogo3_cr",
  "spdf_explorer33_ic",
  "spdf_pioneer7_crt",
  "spdf_ats1_es",
  "spdf_ats1_omni",
  "spdf_ats1_sid",
  "spdf_ats2_omni",
  "spdf_imp4_spme_hourly",
  "spdf_imp4_chicago_rast",
  "spdf_imp4_utd_anisotropy",
  "spdf_imp4_gsfc_273min",
  "spdf_imp4_btl_lest",
  "spdf_explorer35_ic",
  "spdf_pioneer8_cr",
  "spdf_ogo5_berkeley_el",
  "spdf_ogo5_berkeley_pa",
  "spdf_ogo5_heavy_nuclei",
  "spdf_ogo5_e13_realtime",
  "spdf_ogo5_e13_playback",
  "spdf_ogo5_chicago_e09",
  "spdf_ov1_13_electrons",
  "spdf_injun5_master",
  "spdf_injun5_ssd"
 ],
 "licence_basis": "NASA SPDF open-data archive (Rules of the Road: freely available, no use restriction; acknowledgment requested). US government missions (Explorer 4, Explorer 7, Injun 1, Injun 3, Telstar 1, Telstar 2, Relay 1, Transit 5E-1, OGO 1, Explorer 21, Injun 4, Mariner 4, Explorer 26, Explorer 28, Pioneer 6, OGO 3, Explorer 33, Pioneer 7, ATS 1, ATS 2, IMP 4, Explorer 35, Pioneer 8, OGO 5, OV1-13 (USAF), Injun 5); investigator-supplied records restored by NSSDC and hosted by NASA. Alouette 2 (Canada, NRC): the experimenter's tapes deposited at NSSDC, same terms. Zond 3, Venera 2, Venera 3 and Venera 4 (USSR): Moscow State University measurements restored under NASA grant NAG5-4656 and served by SPDF with the same terms (acknowledgment of SPDF and TASPD SINP MSU requested); measured facts, not expression.",
 "commercial_use": true,
 "cite": "TerraPulse (terrapulse.info) for the organizing; the sources above for the measurements, as their licence requires."
}