A227-0012
The Final SORCE SOLSTICE and XPS Calibrations and Data Products

Wednesday, 16 December 2020
Poster
Joshua Peter Elliott1, Thomas N Woods2, Martin A Snow3, Blake Vanier1, Emma Patricia Lieb4, Wendy Hawley Carande1 and Steven Mueller1, (1)Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, (2)University of Colorado Boulder, LASP, Boulder, CO, United States, (3)University of Colorado Boulder, Boulder, CO, United States, (4)University of Colorado at Boulder, Boulder, United States
Abstract:
The solar ultraviolet irradiance is a primary energy input into Earth’s atmosphere to influence its photochemistry and dynamics. The NASA Solar Radiation & Climate Experiment (SORCE) mission ended in February 2020, and its final data products of solar irradiance are being archived this year. We present the latest updates of calibrations and new data products for the SOLar STellar Irradiance Comparison Experiment (SOLSTICE), and the XUV Photometer System (XPS) instruments aboard the SORCE spacecraft. SORCE provides a long-term 17-year record of the Solar Spectral Irradiance (SSI) of our home star. SOLSTICE measures the far ultraviolet (FUV: 115-200 nm) and middle ultraviolet (MUV: 200-300 nm) portions of the solar spectrum while the XPS instrument measures wavelengths in the X-ray ultraviolet (XUV: 1-40 nm) range.

For SOLSTICE, we present the latest calibrations and corrections to the data products as well as introduce two new data products:

  • High-cadence hydrogen Lyman-Alpha scan product at full spectral resolution of 0.1 nm and temporal resolution of about a minute,
  • The Magnesium II core-to-wing index product has been split into two products, a daily average version and a per-scan version. Both are based on the new Mg II index algorithm presented by Snow et al. (2019).


For XPS, we will present updated dark-counts and visible-light-counts calibrations for the entire mission dataset, as well as an improved degradation correction. In addition, we performed several special experiments in the first half of 2019 to allow the instrument to collect data from its full set of diodes and filter-wheel positions, which had not been done since late 2005 due to a filter-wheel anomaly that occurred at the time. These measurements are included in the final SORCE XPS data products. The XUV spectral model, known as the XPS Level 4 product, has also been updated with more accurate components for the solar quiet sun and active region variability using NASA Solar Dynamics Observatory (SDO) spectral measurements down to 6 nm.

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