A three-component model of the variability of the solar ultraviolet flux 145-200 nM

Physics

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Solar Cycles, Solar Flux, Solar Rotation, Stellar Models, Twenty-Seven Day Variation, Ultraviolet Radiation, Chromosphere, Emission Spectra, Faculae, Stellar Spectrophotometry, Sunspot Cycle

Scientific paper

The variability of the ultraviolet flux between 145 and 200 nm over both the eleven-year cycle and the 27-day solar rotation period is examined in terms of chromospheric activity, as determined from ground-based observations of the CaII K chromosphere. A three-component model of the solar UV flux is developed which includes the contributions to the full disk flux from both plage and active network emission. Solar cycle and solar rotation variations derived from the model are compared with the results of satellite and rocket experiments and with the two-component model of Cook et al (1980). Finally, possible ways of improving the model are discussed.

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