Time variation of the flare index during the 21st solar cycle

Details Time variation of the flare index during the 21st solar cycle Time variation of the flare index during the 21st solar cycle

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.135..201a&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 135, no. 1, July 1987, p. 201-205.

Astronomy and Astrophysics

Astrophysics

20

Periodic Variations, Solar Cycles, Solar Flares, Chromosphere, Solar Activity, Solar Terrestrial Interactions, Spatial Distribution

Scientific paper

The flare index during the solar activity cycle 21, was calculated for every day from 1 January 1976 to 31 March 1986. The authors have determined that the chromospheric activity for the whole disc was significantly higher during the 21st solar cycle, as compared to the preceding cycle. They have also found out that the activity began and reached its maximum earlier on the northern hemisphere. Finally, they determined that the time variation of the flare indices for the eastern and western hemispheres are in good agreement.

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