OMNI COHO: Hourly Merged Heliospheric Magnetic Field and Plasma Data

NASA's OMNI COHO dataset provides definitive hourly averaged interplanetary parameters from multiple spacecraft. The data includes merged magnetic field and plasma measurements, along with spacecraft ephemeris, in specialized coordinate systems like HGI and RTN. The dataset was last updated on March 13, 2026.

Use Cases

• Modeling solar wind propagation based on averaged magnetic field and plasma parameters.
• Analyzing interplanetary magnetic field structure using the described HGI and RTN coordinate systems.
• Correlating spacecraft position (ephemeris) with observed plasma flow longitude and latitude angles.
• Studying long-term heliospheric conditions using the definitive, hourly-averaged time series.

Strengths

• Data is described as 'definitive', indicating a processed, authoritative version.
• Parameters are merged from multiple spacecraft, providing a multi-source perspective.
• Includes detailed coordinate system definitions (HGI, RTN) for precise spatial analysis.

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.
• Description metadata is technical but lacks specifics on data collection periods or spacecraft used.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Hourly averaged definitive parameters from multispacecraft observations.

Time Range

null

Freshness

Last updated 2026-03-13 05:55:51.587130; freshness should be verified.

Geography

Heliospheric (interplanetary space).