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THEMIS-E Level 1 Probe State Data

Published by CDAWeb, SPDF, THEMIS | National Aeronautics and Space Administration | Catalog Last Checked: September 09, 2026 at 12:32 AM | Dataset Last Updated: September 08, 2026
The L1 STATE files contain the following data, sampled at one-minute intervals: * probe position and velocity in GEI, GSE, and GSM coordinates; * flags to indicate regions of interest and maneuver status; * RA and declination of spin axis; * spin period and spin phase; * spin model parameters for high-precision interpolation of spin phase between one-minute data points. Version number indicates data source as follows: * V00: predicted ephemeris and attitude, no spin period or spin phase; * V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry; * V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data; * V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing). Produced by Mission Ops, Science Ops and Science Team.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
[
  "026:00"
]
contactPoint 
{
  "fn": "NASA Space Physics Data Facility",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:NASA-SPDF-Support@nasa.onmicrosoft.com"
}
description The L1 STATE files contain the following data, sampled at one-minute intervals: * probe position and velocity in GEI, GSE, and GSM coordinates; * flags to indicate regions of interest and maneuver status; * RA and declination of spin axis; * spin period and spin phase; * spin model parameters for high-precision interpolation of spin phase between one-minute data points. Version number indicates data source as follows: * V00: predicted ephemeris and attitude, no spin period or spin phase; * V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry; * V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data; * V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing). Produced by Mission Ops, Science Ops and Science Team.
distribution 
[
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "ftps://spdf.gsfc.nasa.gov/pub/data/themis/the/l1/state/"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "http://themis.ssl.berkeley.edu/data/themis/the/l1/state/"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "http://themis.ssl.berkeley.edu/overview_data.shtml"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "http://themis.ssl.berkeley.edu/roadrules.shtml"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=THE_L1_STATE&index=sp_phys"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "https://cdaweb.gsfc.nasa.gov/hapi"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "https://helio.data.nasa.gov/dataset/THEMIS_E_Ephemeris_PT01M"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "https://hpde.io/NASA/NumericalData/THEMIS/E/Ephemeris/PT01M"
  },
  {
    "@type": "dcat:Distribution",
    "format": "PDF",
    "mediaType": "application/pdf",
    "downloadURL": "https://spdf.gsfc.nasa.gov/pub/data/themis/documents/tdas/docs/thm_ogs_431m_ephemeris_format_definition.pdf"
  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
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  },
  {
    "@type": "dcat:Distribution",
    "format": "BIN",
    "mediaType": "application/octet-stream",
    "downloadURL": "https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi"
  }
]
identifier https://doi.org/10.48322/gksw-6n04
keyword 
[
  "ephemeris"
]
landingPage https://doi.org/10.48322/gksw-6n04
license https://www.usa.gov/government-works
modified 2026-09-08
programCode 
[
  "026:000"
]
publisher 
{
  "name": "CDAWeb, SPDF, THEMIS",
  "@type": "org:Organization"
}
theme 
[
  "Heliophysics"
]
title THEMIS-E Level 1 Probe State Data

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