THEMIS-A SST: Electron and Ion Flux Spectrograms (30 keV - 300 keV)

THEMIS-A's Solid State Telescope measures superthermal electron and ion intensity. The instrument covers 92% of the sky with sensors measuring particles between 30-300 keV for ions and 30-100 keV for electrons. Data includes full distributions over 128 angles and 16 energy bins, reduced distributions over 6 angles, and burst mode data over 64 angles.

Use Cases

• Modeling magnetospheric particle dynamics based on electron and ion flux measurements
• Analyzing plasma sheet edge phenomena based on the instrument's mechanical attenuator for dynamic range
• Studying angular particle distributions based on data measured over 128 angles
• Investigating magnetic contamination reduction based on quadrapole fields from electron broom magnets

Strengths

• High angular resolution with data measured over 128 angles
• Broad energy coverage from 30 keV to 300 keV for ions and up to 6000 keV maximum capability
• High sky coverage of 92% achieved by opposing sensor pairs

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-A spacecraft.

Freshness

Last updated 2026-03-13 10:52:36.748869; freshness should be verified