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Laboratory for Atmospheric and Space Physics

SOLSTICE High Resolution Daily Product File Summary

The SORCE SOLSTICE Solar Spectral Irradiance (SSI) High Resolution data product is constructed using measurements from the SORCE SOLSTICE instrument, which are merged into daily solar spectra over the spectral intervals shown in table below. This data product provides a higher resolution version of the SOLSTICE data product on a fixed wavelength scale, sampled at 0.025nm intervals. Irradiances are reported at a mean solar distance of 1 AU and zero relative line-of-sight velocity with respect to the Sun.
Learn more about SORCE SSI data products.


Provides precise daily measurements of solar spectral irradiance at ultraviolet wavelengths from 115 nm to 310 nm with a native spectral resolution of approximately 0.1 nm.
SOLSTICE makes daily solar irradiance measurements and compares them to the irradiance from an ensemble of 18 stable early-type stars. This approach provides an accurate monitor of instrument in-flight performance and provides a basis for solar-stellar irradiance comparison for future generations.

Measuring Instrument SOLSTICE (A&B)
Temporal Cadence Daily
Detector Photomultiplier Tubes
Spectral Range 115 – 310 nm
Spectral Res. 0.1 nm
Sampling Interval 0.025 nm
Accuracy 2 – 6%
Long-Term Repeatability 0.2 – 0.5%/yr
Data Level 3


SOLSTICE Data Product Release Notes