Variability of solar Lyman alpha and total solar irradiance

Details Variability of solar Lyman alpha and total solar irradiance Variability of solar Lyman alpha and total solar irradiance

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..648p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 648-653. NOAA-supported research.

Astronomy and Astrophysics

Astrophysics

14

Lyman Alpha Radiation, Solar Cycles, Irradiance, Sunspots, Ultraviolet Radiation

Scientific paper

Variation of ultraviolet and total solar irradiance is investigated during the declining portion of solar cycle 21, through solar cycle minimum and into the rising portion of solar cycle 22. Both the Lyman alpha and total irradiance decrease during the declining phase of solar cycle 21 and increase with the growing new activity of solar cycle 22. The same changes are evident in a variety of solar activity indices, such as 10.7 cm radio flux, Ca-K plage index and projected sunspot areas. However, while the total irradiance, 10.7 cm radio flux, Ca-K plage index and projected sunspot areas each reach minimum levels in early 1985 with a flat background during the following two years, the Lyman alpha flux slowly decays to a brief minimum in mid-1986, around the time of magnetic solar minimum.

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