Title
Long-term changes of polar activity of the Sun Long-term changes of polar activity of the Sun
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Dordrecht :Springer ,
Subject
Physics
Source (journal)
Solar physics. - Dordrecht
Source (book)
1st International Symposium on Space Climate, JUN 20-23, 2004, Oulu, FINLAND
Volume/pages
224(2004) :1 , p. 49-59
ISSN
0038-0938
ISI
000228849200005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We discuss long-time changes of polar activity of the Sun using the new observational data sets in the optical range during 1872-2001. A study of the secular and cycle variations of the magnetic activity at the high-latitude regions is the main goal that includes polar magnetic field reversals during 1872-2001 and secular changes of the duration of polar activity cycles. The secular increase of the area of polar zones during the minimum activity in the last 120 years and as consequence a decrease of coronal temperature of the Sun in the high-latitude zones during the last 50 years. Correlation between the polar cycles of CaII-K bright points with the Wolf sunspot numbers cycles, W(t), and the 22-year polar magnetic cycles of CaII-K bright points at the high latitudes during 1905-1995 is discussed.
E-info
https://repository.uantwerpen.be/docman/iruaauth/025a40/7b46574.pdf
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