Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...50..447k&link_type=abstract
Solar Physics, vol. 50, Nov.-Dec. 1976, p. 447-456.
Astronomy and Astrophysics
Astronomy
Chromosphere, H Alpha Line, Nonthermal Radiation, Solar Flares, Solar Limb, Solar X-Rays, Spaceborne Astronomy, Explorer Satellites, Solar Activity, X Ray Astronomy
Scientific paper
An attempt has been made to determine the directivity of solar nonthermal X-ray emission, using data obtained from the Prognoz and Explorer satellites. The frequency of occurrence of X-ray bursts and the mean intensities of the emission are studied as a function of distance from the central meridian. The most complete statistics have been obtained for the 4-24-keV X-ray bursts for the period 1970-1973. The X-ray burst frequency of occurrence normalized to the corresponding H-alpha flare frequency increases towards the solar limb. During the studied period, this trend is more pronounced to the east than to the west. Distributions of the mean intensities of X-ray bursts are very similar to those of the frequency of occurrence of X-ray bursts; the effect is more noticeable for low-intensity bursts. The effect of the east-west asymmetry for H-alpha flares has been found to vary in magnitude and direction during the 20th solar activity cycle.
Chupova L. M.
Kovrizhnikh O. M.
Savenko I. A.
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