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Title:
Solar 'hot spots' are still hot
Authors:
Bai, Taeil
Affiliation:
AA(Stanford University, CA)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. L17-L20. (ApJL Homepage)
Publication Date:
11/1990
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Solar Activity Effects, Solar Flares, Solar Rotation, Solar Temperature, Sunspot Cycle, Gamma Ray Bursts, Solar Cycles, Solar Maximum Mission
DOI:
10.1086/185864
Bibliographic Code:
1990ApJ...364L..17B

Abstract

Longitude distributions of solar flares are not random but show evidence for active zones (or hot spots) where flares are concentrated. According to a previous study, two hot spots in the northern hemisphere, which rotate with a synodic period of about 26.72 days, produced the majority of major flares, during solar cycles 20 and 21. The more prominent of these two hot spots is found to be still active during the rising part of cycle 22, producing the majority of northern hemisphere major flares. The synodic rotation period of this hot spot is 26.727 + or - 0.007 days. There is also evidence for hot spots in the southern hemisphere. Two hot spots separated by 180 deg are found to rotate with a period of 29.407 days, with one of them having persisted in the same locations during cycles 19-22 and the other, during cycles 20-22.

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