Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ge%26ae..30..465b&link_type=abstract
Geomagn. Aeron., Vol. 30, No. 4, p. 465 - 467
Physics
Solar Active Regions: Interplanetary Plasma, Solar Active Regions: Space Distribution
Scientific paper
Plots of the longitudinal distribution of various manifestations of solar activity according to the papers of a number of authors are analyzed. The slopes of the active longitudes found are calculated. A similar plot of these slopes reveals the existence of two main directions of active longitudes that rotate more rapidly than the Carrington rotation. The average value of the synodic rotation of the first direction is 26.77 days and of the second direction is 27.16 days. A combined plot of all active longitudes shows that the active longitudes of various activity indices, and according to data of various authors, overlap to a definite extent and that both directions cross in the course of several 11-year cycles without interruption - the first with a step of 45 - 55 rotations, and the second with a step of 200 rotations of the Sun. Both these active longitudes have, their own reflection in the two main slopes of the sector boundaries of the IMF shown by Svalgaard and Wilcox and rotating synoptically in 26.84 and 27.44 days.
Bumba Vaclav
Heina L.
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