Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X rays

Details Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X rays Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X rays

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710318d&link_type=abstract

Journal of Geophysical Research, vol. 87, Dec. 1, 1982, p. 10318-10324.

Physics

12

Faculae, Irradiance, Periodic Variations, Solar Flux Density, Solar Rotation, Solar X-Rays, Sunspots, Ultraviolet Radiation, Goes Satellites, Nimbus 7 Satellite, Stellar Models

Scientific paper

Variations in the total solar irradiance, solar UV spectral irradiance, and solar soft X-ray emission caused by active region evolution and solar rotation are analyzed by using concurrent measurements from the NIMBUS 7 and GOES satellites. The observations are interpreted by using simple empirical models that relate ground-based observations of the size and location of sunspots and plages to the full-disk temporal variations. It is found that the major dips in the photospheric total solar irradiance S, which are evident in both satellite measurements and model predictions, are usually not accompanied by outstanding enhancements in the chromospheric and upper photospheric UV spectral irradiance or coronal X rays. The main cause of this difference between the variability of S and of the UV flux is that the total chromospheric plage enhancements are not outstanding at those times when the total sunspot are outstanding. X rays are even more variable because of a much wider CMD sensitivity.

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