Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp61a05b&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP61A-05
Physics
7509 Corona, 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162), 7544 Stellar Interiors And Dynamo Theory, 7549 Ultraviolet Emissions
Scientific paper
We present the results of investigation of EUV coronal structures in 1996-2000 using SOHO/EIT data in 171A, 195A, 284A and 304A. During this period polarward and equatorward migrating waves of activity have been found in axysymmetrical distributions of EUV intensity in all four lines. In the ratio of 195A and 171A intensities, which is a proxy of coronal temperature from 1 MK to 2 MK, the polar branch is not present. We discuss the physical nature of the polar wave of activity and conclude that it is related to dense plasma loops which are cooler then the loops related to the equatorward migrating wave. The latter reflects coronal structures connected with active regions and complexies of solar activity. The polar activity wave is caused by reconnection between the polar magnetic field and the magnetic field of `following' parts of active regions, and, probably, plays an important role in the solar cycle.
Benevolenskaya Elena E.
Kosovichev Aleksandr G.
Scherrer Philip H.
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