Solar Radiation and Climate Experiment (SORCE) X-Ray Photometer System (XPS): Final Data-Processing Algorithms

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<jats:title>Abstract</jats:title><jats:p>The <jats:italic>X-ray Photometer System</jats:italic> (XPS) is one of four instruments onboard NASA’s <jats:italic>Solar Radiation and Climate Experiment</jats:italic> (SORCE) mission. The SORCE spacecraft operated from 2003 to 2020 to provide key climate-monitoring measurements of total solar irradiance (TSI) and solar spectral irradiance (SSI). The XPS is a set of photometers to measure the solar X-ray ultraviolet (XUV) irradiance shortward of 34 nm and the bright hydrogen emission at 121.6 nm. Each photometer has a spectral bandpass of about 7 nm, and the XPS measurements have an accuracy of about 20%. The updates for the final data-processing algorithms for the XPS solar-irradiance data products are described. These processing updates include improvements for the instrumental corrections for background signal, visible-light signal, and degradation trending. Validation of these updates is primarily with measurements from a very similar XPS instrument onboard NASA’s <jats:italic>Thermosphere-Ionosphere-Mesosphere-Energetics-Dynamics</jats:italic> (TIMED) mission. In addition, the XPS Level 4 spectral model has been improved with new reference spectra derived with recent XUV observations from NASA’s <jats:italic>Solar Dynamics Observatory</jats:italic> (SDO) and <jats:italic>Miniature X-ray Solar Spectrometer</jats:italic> (MinXSS) cubesat.</jats:p>

Journal

  • Solar Physics

    Solar Physics 297 (5), 64-, 2022-05

    Springer Science and Business Media LLC

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