LISIRD Composite Lyman Alpha: Daily Solar Irradiance from 1947 to Present

LISIRD supplies daily solar Lyman alpha (121.5 nm) irradiance levels in photons/s/cm**2. The data product combines measurements from multiple spacecraft and models, including AE-E/ESUM, SME/SUVM, UARS/SOLSTICE, TIMED/SEE, and SORCE/SOLSTICE, and is available from 1947 to near-current. This dataset is provided by the National Aeronautics and Space Administration (NASA) via the LISIRD interface at the University of Colorado's Laboratory for Atmospheric and Space Physics.

Use Cases

• Modeling solar influence on Earth's upper atmosphere based on long-term Lyman alpha irradiance time series.
• Correlating solar activity proxies like F10.7 with direct Lyman alpha measurements from spacecraft.
• Analyzing long-term trends in solar ultraviolet output from the composite multi-instrument record.
• Validating and calibrating solar irradiance models using the referenced spacecraft and model data sources.

Strengths

• Data spans a long temporal range from 1947 to near-current, enabling trend analysis.
• Integrates measurements from multiple spacecraft and models, likely improving data continuity and reliability.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific modeling tasks.

Provenance

Source

National Aeronautics and Space Administration (NASA), via the LISIRD interface at the University of Colorado/LASP.

Collection Method

Composite data product combining measurements from multiple spacecraft instruments (AE-E/ESUM, SME/SUVM, UARS/SOLSTICE, TIMED/SEE, SORCE/SOLSTICE) and models (F10.7, Mg).

Time Range

1947 to near-current.

Freshness

Last updated 2026-03-13 06:35:43.191700; freshness should be verified.

Geography

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