SOHO CELIAS-SEM: Daily Solar EUV Flux and Spacecraft Position Data

Daily average solar extreme-ultraviolet photon flux data from the SOHO spacecraft's CELIAS-SEM instrument, including raw count rates and derived fluxes in specific wavelength channels. The dataset, provided by NASA, also contains the SOHO spacecraft's heliocentric location and distance. The data is stored in CDF format and was last updated in March 2026.

Use Cases

• Modeling solar irradiance variability based on daily average EUV photon fluxes.
• Correlating spacecraft position with solar observations based on heliocentric location data.
• Analyzing long-term trends in solar activity based on daily time-series flux data.
• Validating space weather models based on First Order and Central Order channel measurements.

Strengths

• Data originates from the NASA SOHO mission, a major solar observatory.
• Includes derived scientific products like First Order (26-34 nm) and Central Order (0.1-50 nm) photon fluxes.
• Provides spacecraft position context with heliocentric location and distance.
• Original instrument publication and release notes are cited for scientific context.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and temporal coverage range are unknown, which may limit suitability assessment.
• Data is provided in CDF format, which may require specific tools for analysis.

Provenance

Source

National Aeronautics and Space Administration (NASA), SOHO mission, CELIAS-SEM instrument.

Collection Method

Satellite observations from the SOHO spacecraft, processed into daily averages and converted from ASCII to CDF format.

Time Range

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Freshness

Last updated 2026-03-13 04:51:37.591034; freshness should be verified.

Geography

Heliocentric (space-based observations from the SOHO spacecraft).