Dependence of UV radiance of the quiet Sun on the solar cycle

Details Dependence of UV radiance of the quiet Sun on the solar cycle Dependence of UV radiance of the quiet Sun on the solar cycle

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..227p&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Physics

1

Uv Radiance, Magnetic Field

Scientific paper

Recent SOHO measurements of UV radiance of the quiet Sun show a dependence of the radiance on the solar cycle. We study the hypothesis that changes in the magnetic network are causing these variations. The quiet-Sun variability is investigated with the two EUV instruments CDS and SUMER and the MDI magnetograph on SOHO. We find that although the magnetic flux of the quiet network increases by a rather low percentage over the rising part of the solar cycle, its variation is well correlated with the radiance change in the He I 584 Å line. The main change occurs in the flux of the strong network elements while the weaker elements do not exhibit a significant change.

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