Recent decreasing trend in the total solar irradiance - 1981-1992 spacecraft measurements

Details Recent decreasing trend in the total solar irradiance - 1981-1992 spacecraft measurements Recent decreasing trend in the total solar irradiance - 1981-1992 spacecraft measurements

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stia...9339499l&link_type=abstract

American Geophysical Union, Meeting, Baltimore, MD, May 24-28, 1993, Paper, 18 p.

Physics

Earth Radiation Budget Experiment, Irradiance, Solar Activity, Solar Radiation, Solar Radio Emission, Solar Maximum Mission, Solar Rotation, Sunspots

Scientific paper

During 1990-1992, pyrheliometric measurements from the Earth Radiation Budget Satellite (ERBS) indicate that the total solar irradiance is decreasing at an annual rate of -0.2 Wm exp -2 with declining solar magnetic activity. Regression analyses of spacecraft irradiance measurements and of solar magnetic activity indices (10.7-cm solar radio flux and photometric sunspot index) verified the ERBS decreasing trend. The decreasing rate suggests that the irradiance should decrease 0.1 percent by 1997 when minimum solar magnetic activity is forecasted. If the forecasted 1990-1997 irradiance decrease is equal in magnitude to the magnitude of the 1986-1989 irradiance rise, one could conclude that solar irradiance variability has a strong 11-year component and no significant 22-year component. The ERBS measurements yielded 1365.4 +/- 0.7 Wm exp -2 as the mean irradiance value. In this paper, 1981-1992 spacecraft irradiance measurements are presented and compared with solar indices.

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