Long-Term Changes of Polar Activity of the Sun

Details Long-Term Changes of Polar Activity of the Sun Long-Term Changes of Polar Activity of the Sun

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..224...49m&link_type=abstract

Solar Physics, Volume 224, Issue 1-2, pp. 49-59

Physics

2

Scientific paper

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.

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