Long-Term Changes of Polar Activity of the Sun |
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| Authors: | V I Makarov A G Tlatov D K Callebaut |
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| Institution: | (1) Pulkovo Astronomical Observatory, 196140 St. Petersburg, Russia;(2) Physics Department, UIA, University of Antwerp, B-2610 Antwerp, Belgium |
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| 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. |
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