MMS HPCA: Magnetospheric Ion Composition and Energy Counts at 0.625-Second Resolution

NASA's Magnetospheric Multiscale (MMS) mission provides time-of-flight counts for five ion species in Earth's magnetosphere. The Hot Plasma Composition Analyzer (HPCA) instruments measure plasma energy and composition across 63 energy levels, 16 elevation anodes, and 16 azimuths. Data is collected in 10-second survey mode intervals and processed to Level 2.

Use Cases

• Modeling magnetospheric plasma dynamics based on energy and species composition data.
• Analyzing ion species distribution (H+, He++, He+, O+) across 63 energy levels.
• Studying plasma behavior over time based on 0.625-second resolution survey data.
• Correlating plasma measurements with spacecraft spin phase using 16 azimuth sectors.

Strengths

• Measures five distinct ion species: protons, alpha particles, helium ions, singly charged oxygen, and background counts.
• Provides high-resolution energy analysis across 63 discrete energy levels from 1 eV to 40 keV.
• Captures spatial anisotropy through 16 elevation anodes and 16 azimuth sectors per measurement cycle.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale statistical analysis.
• Data is provided in BIN and HTML formats, which may require specialized tools for parsing and analysis.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Collected by the Hot Plasma Composition Analyzer (HPCA) instruments aboard the Magnetospheric Multiscale (MMS) spacecraft.

Time Range

null

Freshness

Last updated 2026-03 13 06:19:46.053660; freshness should be verified.

Geography

Earth's magnetosphere (space-based measurements).