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Wednesday, July 6, 2022
Home This image of the Sun’s upper photosphere shows bright and dark magnetic structures responsible for variations in TSI. (SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.) This image of the Sun's upper photosphere shows bright and dark magnetic structures responsible for variations in TSI. (SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.)

This image of the Sun’s upper photosphere shows bright and dark magnetic structures responsible for variations in TSI. (SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.)

This image of the Sun's upper photosphere shows bright and dark magnetic structures responsible for variations in TSI. (SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.)

This image of the Sun’s upper photosphere shows bright and dark magnetic structures responsible for variations in TSI. (SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.)

Space-borne measurements of the total solar irradiance (TSI) show ~0.1 percent variations with solar activity on 11-year and shorter timescales. These data have been corrected for calibration offsets between the various instruments used to measure TSI. (SOURCE: Courtesy of Greg Kopp, University of Colorado.)