Variation of the solar constant during the solar cycle

Details Variation of the solar constant during the solar cycle Variation of the solar constant during the solar cycle

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.127...55p&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 127, Nov. 1986, p. 55-71.

Astronomy and Astrophysics

Astrophysics

11

Periodic Variations, Solar Activity Effects, Solar Constant, Solar Cycles, Nimbus 7 Satellite, Solar Maximum Mission, Sunspots

Scientific paper

Measurements of the Nimbus-7 and Solar Maximum Mission satellites reported temporary large decreases of the solar constant of the order of a few tenths of a percent on a time-scale from days to weeks. Investigations show that these decreases were caused by 'active' sunspot groups with fast development and complex structure. This connection between the solar constant variation and the appearance of the active groups seems to be clearer in the maximum of the solar activity. At the time of the solar minimum, mainly in the second part of 1984, there were practically no active sunspot groups on the solar disk, the value of the solar constant only fluctuated around its mean without large variation. The results of time series analyses show that the periodicity of the solar constant values, of young and active spot areas was nearly 23.5 days in 1980, which increases to 28 days towards the minimum of the solar cycle till 1983. During this time interval the main periodicity of the old, 'passive' spot areas was around 28 days. In 1984, at the time of the solar minimum, there were practically no obvious periodicities in the projected areas of the different types of the sunspot groups.

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