Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cha%26a..20r.508z&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 20, Issue 4, p. 508-509.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Results of this study show that the same sunspot group may successively show clockwise and counterclockwise rotation during its appearance on the solar disk, that 1 ~ 2 days before the flare, the rotational velocity reaches a maximum, and that after the flare, the group may reverse its direction of rotation and strong shearing and proton flares may occur again. The common characteristics of the active regions of proton flares are: 1) the morphology is the single circular δ-type sunspot with many umbrae of opposite polarities locked within one penumbra, 2) the sunspot area > 1000×10-6 hemisphere, and span > 10°, and 3) a fast rotation. Such an active region, if showing signs of increasing activity at the west limb will, as it disappears around the back and reappears later at the east limb, certainly erupt again, accompanied by strong proton events.
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