ACRIM II: Daily Total Solar Irradiance from the UARS Satellite

Version 2 daily mean total solar irradiance measurements collected by the Active Cavity Radiometer Irradiance Monitor II instrument aboard the Upper Atmosphere Research Satellite. The data are constructed from daily shutter cycle results and are provided in Native format.

Use Cases

• Modeling solar energy input to Earth's climate system based on daily total solar irradiance.
• Analyzing long-term solar variability trends based on daily mean time-series data.
• Validating and calibrating other solar irradiance models based on satellite instrument data.

Strengths

• Data is identified as Version 2, suggesting a processed and validated release.
• Daily means are constructed from instrument shutter cycles, indicating a defined processing method.
• Data originates from the National Aeronautics and Space Administration, a recognized authority.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Freshness should be verified; last metadata update is dated 2026-03-12.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Measurements gathered by the ACRIM II instrument on the UARS satellite, processed to daily means from shutter cycles.

Time Range

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Freshness

Last metadata update: 2026-03-12 19:36:12.468340

Geography

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