THEMIS-A: Spacecraft Electric and Magnetic Field Spectral Data from Filter Bank

The dataset contains digitally computed Filter Bank spectra and peak/average values for electric and magnetic fields measured by the THEMIS-A spacecraft. It is produced by NASA with contributions from the University of California, Berkeley, the Laboratory for Atmospheric and Space Physics, and the Centre d'étude des environnements terrestre et planétaires. The data was last updated on 2026-03-13.

Use Cases

• Analyzing wave power spectra across specific frequency bands (e.g., 2.26 Hz to 2.689 kHz) based on the described filter bank cascades.
• Studying peak and average electric field values in the high-frequency (HF) band based on the E12HF signal recorded over 62.5 ms windows.
• Investigating the relationship between electric (E12DC) and magnetic (SCM1) field signals as described in the processing pipeline.
• Comparing computationally efficient filter bank spectra to potential full FFT spectra for specific mission phases.

Strengths

• Data processing is explicitly described, detailing a 12-13 cascade filter bank system with specific frequency bands.
• Specific sampling frequencies and window sizes are provided, such as 16 Hz for E12HF averages and initial rates of 8,192 or 16,384 samples/s.
• Contributing institutions and sensor designers (UCB, LASP, CETP) are clearly credited.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and file size are unknown, which may limit suitability assessment.
• The description is highly technical regarding signal processing; domain expertise is required for interpretation.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data from the Electric Field Instrument and Search Coil Magnetometer on the THEMIS-A spacecraft, processed by a Digital Fields Board using a described filter bank algorithm.

Time Range

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Freshness

Last updated 2026-03-13 04:34:09.873449; freshness should be verified.

Geography

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