Thirteen-day periodicity and the center-to-limb dependence of UV, EUV, and X-ray emission of solar activity

Details Thirteen-day periodicity and the center-to-limb dependence of UV, EUV, and X-ray emission of solar activity Thirteen-day periodicity and the center-to-limb dependence of UV, EUV, and X-ray emission of solar activity

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..130..369d&link_type=abstract

(Committee of European Radio Astronomers, SNSF, URSI, et al., Workshop on Particle Beams in the Solar Atmosphere, Braunwald, Swi

Physics

52

Periodic Variations, Solar Activity, Solar Rotation, Solar X-Rays, Twenty-Seven Day Variation, Ultraviolet Radiation, Extreme Ultraviolet Radiation, Iron, Solar Limb, Spatial Distribution

Scientific paper

This paper discusses the satellite and ground-based observatons of 13- to 14-day quasi-periodicity ('the 13-day periodicity') in the full-disk solar UV fluxes, with an emphasis on the wavelength dependence in the X-ray, EUV, and UV range. It is shown that the 13-day periodicity is uniformly strong at most wavelengths in the 1750-2900 A range, where the flux originates from the upper photosphere, the temperature minimum, and the lower chromosphere and is moderately strong for lines from the chromosphere, such as the Mg II h and k absorption lines, the He I absorption line, the EUV emission lines of H L-beta, He I, and He II, and in the chromospheric Ca-K plage index P. It is also shown that simple models can explain qualitatively the wavelength-dependent characteristics of the 13-day periodicity in terms of the average solar central angle dependence of the active region emission.

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