THEMIS-D: Electron and Ion Energy Flux Spectrograms from Solid State Telescope

THEMIS-D's Solid State Telescope measures superthermal electron and ion intensity across 128 angles and 16 energy bins. The instrument uses paired sensors and quadrapole magnetic fields to reduce contamination, covering up to 92% of the sky. NASA provides this data, last updated in March 2026.

Use Cases

• Modeling magnetospheric particle dynamics based on electron and ion flux measurements between 30-300 keV.
• Analyzing plasma sheet edge conditions based on the instrument's mechanical attenuator for dynamic range.
• Studying angular particle distributions based on data measured over 128 angles and 16 energy bins.
• Comparing ion and electron sensor data from opposing pairs oriented in the spacecraft rotation plane.

Strengths

• Instrument covers up to 92% of the sky using opposing sensor pairs.
• Data includes full distribution measurements over 128 angles and 16 energy bins.
• Electron sensors measure particles between 30-100 keV, ions between 30-300 keV.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Measured by the Solid State Telescope (SST) instrument on the THEMIS-D spacecraft.

Freshness

Last updated 2026-03-13 04:32:20.781043; freshness should be verified.