EPACT/LEMT: Solar Energetic Particle Anisotropies and Solar Wind Parameters, 1997-2006

NASA's EPACT/LEMT instrument provides hourly anisotropies for 2.5-5 MeV/n H, He, O, and Fe nuclei, plus 5-8 MeV/n He, during 39 multi-day solar particle events from 1997 to 2006. The dataset includes first-, second-, and third-order spacecraft-frame anisotropies, ion spectral parameters, and solar wind parameter averages like magnetic field magnitude and solar wind speed. Data are presented in ASCII files with comma-separated values, as described in Tan et al. 2007.

Use Cases

• Modeling particle transport in the heliosphere based on first-, second-, and third-order anisotropy vectors.
• Correlating solar wind flow speed and magnetic field direction with energetic particle anisotropies.
• Analyzing ion spectral power law indices (gamma) across different particle species (H, He, O, Fe).
• Studying the evolution of multi-day solar particle events using hourly-resolution data.

Strengths

• Covers 39 distinct multi-day solar energetic particle events from 1997 to 2006.
• Provides hourly-resolution data for multiple particle species (H, He, O, Fe) across specific energy ranges.
• Includes standard deviations for all hourly-averaged parameters, offering uncertainty estimates.

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 coverage is limited to selected event intervals rather than a continuous time series.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Collected by the EPACT/LEMT instrument on the Wind spacecraft.

Time Range

1997-2006

Freshness

Last updated 2026-03-13 03:47:30.299508; freshness should be verified.