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Solar-Cycle Variability Results from the Solar Radiation and Climate Experiment (SORCE) Mission.

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The Solar Radiation and Climate Experiment (SORCE) mission provided 17 years of solar irradiance data. SORCE found minimal differences in solar cycles 23 and 24, suggesting high instrument stability and valuable data for climate studies.

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Area of Science:

  • * Solar physics and climate science.
  • * Analysis of solar variability and its impact on Earth's climate.

Background:

  • * The Solar Radiation and Climate Experiment (SORCE) was a NASA mission.
  • * Operated from 2003 to 2020, collecting crucial climate-monitoring data.

Purpose of the Study:

  • * To provide long-term measurements of total solar irradiance (TSI) and solar spectral irradiance (SSI).
  • * To analyze solar variability across Solar Cycles 23, 24, and the beginning of 25.
  • * To compare solar irradiance levels during different solar cycle phases and minima.

Main Methods:

  • * Continuous monitoring of TSI and SSI using SORCE instruments.
  • * Comparison of irradiance data between Solar Cycle 23 and Solar Cycle 24.
  • * Assessment of solar-cycle minima levels in 2008-2009 and 2019-2020.
  • * Consistency checks with solar rotation timescales and irradiance models.

Main Results:

  • * Observed minimal differences between solar irradiance in Solar Cycles 23 and 24.
  • * Found that differences between the 2008-2009 and 2019-2020 solar minima were not significant.
  • * Identified differences in SSI variability, particularly for wavelengths >250 nm.
  • * Suggested potential higher accuracy in Solar Cycle 24 SSI data compared to Solar Cycle 23.

Conclusions:

  • * SORCE data demonstrate high instrument stability over an 11-year period.
  • * Solar irradiance variability shows subtle but notable differences between recent solar cycles.
  • * SORCE results provide a valuable reference for ongoing and future solar variability and Sun-climate research.