Surface magnetic fields and UV radiance of the quiet Sun

Details Surface magnetic fields and UV radiance of the quiet Sun Surface magnetic fields and UV radiance of the quiet Sun

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..521p&link_type=abstract

In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun

Physics

Quiet Sun, Uv Radiation, Solar Magnetic Fields

Scientific paper

In order to investigate the correspondence between the quiet-Sun UV radiance and changes in the magnetic network during the solar cycle, we study the quiet-Sun variability with the two EUV instruments CDS (Coronal Diagnostic Spectrometer) and SUMER (Solar Ultraviolet Measurements of Emitted Radiation) and the MDI (Michelson Doppler Imager) magnetograph on SOHO. Using a monthly data set of co-spatial and co-temporal observations of quiet-Sun areas near disk centre we follow the evolution of the quiet Sun over four years from solar minimum to solar maximum conditions. Although the magnetic flux of the quiet network increases by a rather low percentage over the solar cycle, its variation is well correlated with the radiance change in the He I 584 Å line. We test our data set of quiet-Sun measurements for a pixelwise relation between magnetic flux density and radiance.

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