Polar TIMAS: Mass-Resolved Ion Energy Spectra from the Polar Mission

Mass resolved ion energy angle spectra covering nearly the full 4π solid angle and the energy range 15 eV/q to 33 eV/q. The dataset includes H+, O+, He+, and He++ number fluxes and statistical uncertainties processed by the TIMAS science team, with data acquired from the Polar satellite mission. It was produced by the National Aeronautics and Space Administration, with versions released from 1997 to 2002.

Use Cases

• Modeling magnetospheric plasma populations based on mass-resolved ion fluxes.
• Analyzing ion energy distributions in regions like the cusp/cleft and radiation belts based on described algorithm corrections.
• Studying pitch-angle and energy spectra for H+, O+, He+, and He+ ions across a 4π solid angle.
• Selecting high-resolution data subsets using provided Quality, PA_status, and Energy_status indicators.

Strengths

• Covers a broad energy range (15 eV/q to 33 eV/q) and nearly full 4π solid angle.
• Includes data quality indicators (Quality, PA_status, Energy_status) for filtering high-resolution subsets.
• Algorithm versions (V_00 to V_03) document corrections for background subtraction and flux estimation errors.

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 from the specific Polar mission operational period.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data acquired by the Toroidal Imaging Mass-Angle Spectrograph (TIMAS) instrument on the Polar satellite.

Time Range

Covers the operational period of the Polar mission, with data processing versions from 1997 to 2002.

Freshness

Last updated 2026-03-13 05:26:28.136482; freshness should be verified.

Geography

Global coverage from Polar satellite orbits in Earth's magnetosphere.