SOR3SOLD_MGII_018: Daily Solar MgII Core-to-Wing Ratio

SORCE SOLSTICE Level 3 data provides daily averages of the magnesium II core-to-wing index, a key proxy for solar ultraviolet activity. The dataset is a tabular ASCII file containing calendar date, Julian Day, the core/wing ratio, and its absolute uncertainty for each daily measurement. Spectral resolution of 0.1 nm allows the Mg-II doublet to be fully resolved and modeled with Gaussians.

Use Cases

• Tracking long-term solar UV variability based on the daily MgII index time series.
• Correlating solar activity with atmospheric phenomena using the dated ratio measurements.
• Validating solar spectral models using the resolved Mg-II doublet data from the SOLSTICE instrument.
• Assessing measurement uncertainty in solar indices using the provided absolute uncertainty column.

Strengths

• Data is derived from the SOLSTICE instrument with a spectral resolution of 0.1 nm, allowing the Mg-II doublet to be fully resolved.
• Provides a direct, long-term measurement of solar UV activity through the daily MgII core-to-wing ratio.
• Data is structured in a simple, accessible tabular ASCII format suitable for spreadsheet applications.

Limitations

• Critical metadata is missing: exact row count, file size, and complete column specifications are not provided.
• Conflicting last update timestamps exist between sources (2026-04 09 and 2020-02-25), casting doubt on data freshness.
• The license is ambiguously listed as 'other-license-specified' or 'None', requiring further investigation for use.

Provenance

Source

SOLSTICE instrument on the SORCE satellite, processed by GES DISC.

Collection Method

Daily averages from 15 daytime orbit measurements per day, with Gaussian modeling of the spectral doublet.

Time Range

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Freshness

2026-04-09 20:32:02.385561 (conflict with 2020-02-25 source noted in limitations)

Geography

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