Polar TIMAS: Mass Spectral Data for Ion Composition in Earth's Magnetosphere

Polar TIMAS K2 Mass Spectral Data contains mass spectra count rates from the Toroidal Imaging Mass-Angle Spectrograph instrument on the Polar spacecraft. The data product consists of 64 mass steps across 6 large solid angles for 8 selected energy steps, accumulated over 2 to 32 spin periods. NASA produced this dataset, which is referenced in a 1995 Space Science Reviews publication.

Use Cases

• Analyzing ion composition and density based on mass spectra count rates.
• Studying pitch angle distributions based on the 6 angular bins covering nearly 4π steradians.
• Investigating energy-dependent particle fluxes based on the 8 selected energy steps.
• Modeling spacecraft spin-axis-aligned measurements based on the two look directions centered on the spin axis.

Strengths

• Data is structured with 64 mass steps, 6 angular bins, and 8 energy steps, providing multi-dimensional measurements.
• Includes pitch angle information for each of the 6 look directions, which is critical for space physics analysis.
• Produced by NASA and documented in a peer-reviewed Space Science Reviews publication from 1995.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect temporal bias inherent to the specific Polar mission timeframe.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Collected by the Toroidal Imaging Mass-Angle Spectrograph (TIMAS) instrument on the Polar spacecraft.

Time Range

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Freshness

Last updated 2026-03-13 07:34:55.558213; freshness should be verified.

Geography

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