Inconstant Solar Constants and Their Connection with Solar Activity

Details Inconstant Solar Constants and Their Connection with Solar Activity Inconstant Solar Constants and Their Connection with Solar Activity

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lapa...22....1s&link_type=abstract

LAPAN Supplementary Issue, vol. 22, p. 1

Physics

Solar Constant, Solar Activity, Solar Physics, Regression Analysis, Sunspot Cycle, Correlation Coefficients, Mean, Variability, Solar Activity Effects

Scientific paper

Direct measurements of solar constant by satellite show variations over time scales from days, month to years and probably decades. Variations in solar constant caused by changes in the solar active feature such as dark sunspot or bright faculae. Analysis influence of solar activity on the yearly average solar constant by using linear regression analysis shows a strong similarity between solar constant and yearly relative sunspot number. Linear regression analysis between sunspot number and yearly average solar constant for periods 1978 - 1992 found a strong correlation with correlation coefficient of 0.73. In general, the solar constant increased with an increase in solar activity with relative sunspot number as indicator. On solar cycle - 21, the yearly mean value of solar constant reached a maximum in 1979 is 1973,30 W/m2 , and this occurred during the peak of solar activity. Solar constant then decreased slowly to a minimum which lasted from 1981 through 1986 with a lowest value is 1971,3 W/m2 in 1984, while the minimum of solar cycle - 21 on 1986. Solar constant then increased slowly towards a new maximum of solar cycle - 22. On solar cycle - 22, the yearly maximum mean value of solar constant in the active sun years from 1989 through 1992 white the value of 1372,80 W/m2 on 1992, while the maximum of solar cycle - 22 on 1989. The yearly mean value of the solar constant for the period 1978 -1992 is 1372,04 w/m2. The amplitude of the variation from minimum of solar cycle - 21 to maximum of solar cycle - 22 is 150 W/m2 ( 0,11% ). The solar constant variability shows an eleven year cycle, analogous to the eleven year sunspot cycle.

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