TIMED SEE EGS: Daily Solar Irradiance Measurements from Space

Solar irradiance data from the EUV Grating Spectrograph (EGS) aboard the TIMED satellite's SEE instrument. The Level 2 data provides daily time-averaged measurements, corrected to 1 Astronomical Unit and with solar flares removed. The dataset is produced by the National Aeronautics and Space Administration and was last updated in March 2026.

Use Cases

• Modeling solar influence on Earth's upper atmosphere based on daily-averaged EUV irradiance.
• Studying long-term solar variability trends based on time-averaged, flare-removed data.
• Validating space weather models using 1-AU corrected solar irradiance measurements.
• Analyzing correlations between solar EUV output and thermospheric response based on orbital measurement cadence.

Strengths

• Data is corrected to a standard 1 Astronomical Unit distance, enabling comparative analysis.
• Solar flares are removed from the Level 2 averages, focusing on quiescent solar output.
• Measurements are taken approximately 14-15 times per day, providing regular sampling.

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.
• The description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Measurements from the EUV Grating Spectrograph (EGS) aboard the TIMED satellite's SEE instrument, averaged daily.

Time Range

Measurements are taken for about 3 minutes every 97-minute orbit.

Freshness

Last updated 2026-03-13 05:48:11.825661; freshness should be verified.

Geography

Solar observations from space.