{
 "kind": "spacecraft_particle_counts",
 "date": "2026-09-15",
 "built_utc": "2026-09-15T09:04:24+00:00",
 "rows": 18,
 "bytes": 23273,
 "sha256": "2367e054ada90a76acbc05062a05af17d50e6da9a672d58651863dc2d490b0b5",
 "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": "1965-06-04T08:08:33.418380+00:00"
 },
 "source_file": "platform_storehouse/spacecraft_particle_counts/_manifest.parquet",
 "url": "https://data.terrapulse.info/dex/spacecraft_particle_counts/2026-09-15.parquet",
 "latest_url": "https://data.terrapulse.info/dex/spacecraft_particle_counts/latest.parquet",
 "family": "movingplatformdex",
 "storage": "dossier",
 "n_slots_api": 18,
 "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"
 ],
 "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); investigator-supplied records restored by NSSDC and hosted by NASA.",
 "commercial_use": true,
 "cite": "TerraPulse (terrapulse.info) for the organizing; the sources above for the measurements, as their licence requires."
}