THEMIS-E: Spacecraft Electric and Magnetic Field Spectra from Filter Bank Processing

NASA's THEMIS-E spacecraft data provides digitally computed spectra for electric and magnetic fields using a multi-stage Filter Bank algorithm. The instrument processes signals from the Electric Field Instrument and Search Coil Magnetometer, producing average and peak values in six frequency bands from 2.26 Hz to 2.689 kHz. The dataset was last updated in March 2026 and involves contributions from the University of California, Berkeley, the Laboratory for Atmospheric and Space Physics, and the Centre d'étude des environnements terrestre et planétaires.

Use Cases

• Analyzing wave-particle interactions based on electric and magnetic field spectra.
• Studying plasma turbulence across frequency bands from 2.26 Hz to 2.689 kHz.
• Validating signal processing algorithms for spaceborne instrumentation based on the described cascaded filter bank method.
• Investigating magnetospheric dynamics using coupled E12HF peak and average values recorded over 62.5 ms windows.

Strengths

• Data is produced via a 12-13 stage cascaded filter process, reducing computational load for spectral analysis.
• Output includes six specific frequency bins (2.689 kHz, 572 Hz, 144.2 Hz, 36.2 Hz, 9.05 Hz, and 2.26 Hz).
• Peak and average values for the coupled E12HF signal are recorded at a 16 Hz sampling rate over 62.5 ms windows.

Limitations

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

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data from the THEMIS-E spacecraft's Electric Field Instrument and Search Coil Magnetometer, processed by a Digital Fields Board.

Time Range

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Freshness

Last updated 2026-03-13 10:29:06.281682; freshness should be verified.

Geography

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