Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36..205l&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, July 1985, p. 205-213.
Astronomy and Astrophysics
Astronomy
2
Magnetic Storms, Solar Corona, Solar Terrestrial Interactions, Emission Spectra, Kp Index, Magnetic Variations, Solar Cycles
Scientific paper
The relation between variations in the intensity of green solar corona activity and the occurrence of geomagnetic storms is analyzed. Data for epochs of green corona activity between 1965 and 1975 were superimposed on epochs of observed geomagnetic activity, and areas of overlap were noted. It is found that a decrease in the intensity of the green corona occurs at the eastern limb of the sun, the minimum occurring on the 8th day before the beginning of a geomagnetic storm. The phenomenon is conspicuous in the descending phase of the solar cycle, but does not occur during the ascending phase. After a region of decreased green corona emission has appeared at the eastern limb of the sun, geomagnetic activity (represented by Kp indices) increases and reaches a maximum about the 10th day. Regions with lower emission are identified in some cases with coronal holes observed in UV and X-radiation.
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