A mechanism for solar ultraviolet flux variability

Details A mechanism for solar ultraviolet flux variability A mechanism for solar ultraviolet flux variability

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...73...13s&link_type=abstract

Solar Physics, vol. 73, Sept. 1981, p. 13-23.

Physics

2

Atmospheric Models, Chromosphere, Secular Variations, Solar Flux, Twenty-Seven Day Variation, Ultraviolet Radiation, Nimbus 4 Satellite, Solar Activity, Solar Atmosphere, Solar Cycles, Solar Rotation, Solar Temperature

Scientific paper

Following an examination of solar UV emission observed by a filter photometer on Nimbus IV from 1969 to 1973 in an attempt to understand the 27-day and secular variability, two models are proposed to account for the variations: (1) a calcium plage model and (2) a chromospheric network faculae and spicule structure model. An association between UV brightenings and the large scale magnetic field has been found to be consistent with the network model. An increase in the UV emittance can be achieved by raising the effective chromospheric temperature closer to a photospheric level. If the sun's luminosity is constant on these time intervals, the enhanced UV radiation could be partially offset by an overall decrease in photospheric temperature such as that measured by Livingston (1978) in visible photospheric profiles.

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