Estimating the variability of the solar flux between 200 and 300 NM

Details Estimating the variability of the solar flux between 200 and 300 NM Estimating the variability of the solar flux between 200 and 300 NM

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89....1l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 1-9. NOAA-supported research.

Physics

37

Irradiance, Solar Flux, Ultraviolet Radiation, Variability, Estimating, Radiation Measurement, Solar Backscatter Uv Spectrometer, Solar Radiation, Stellar Models

Scientific paper

The variability of the solar UV flux between 200 and 300 nm is investigated by using a simple three-component model in which the total emission is assumed to be composed of contributions from the quiet sun, from active network, and from plage. According to the model predictions, the solar ultraviolet irradiance increased from the minimum to the maximum of solar cycle 21 by 25 percent at 200 nm, by 10 percent at 210-250 nm, and by 2 percent at 300 nm. During solar cycle 20, the variability was slightly less than in cycle 21. The model successfully reproduces, in both phase and amplitude, the short-term UV flux variability associated with solar rotation which has been observed by the SBUV experiment on the Nimbus 7 satellite. For the 11-year solar cycle, the model predicts a solar flux variablity which is consistent, at 200 nm, with the variability at shorter wavelengths (as calculated by Lean et al. 1982) and, at 300 nm, with that of longer visible wavelengths.

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