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Secular and cycle variations of polar activity of the Sun

Published online by Cambridge University Press:  14 March 2005

V.I. Makarov ,
A.G. Tlatov  and
D.K. Callebaut
V.I. Makarov
Affiliation:
Pulkovo Astronomical Observatory, St. Petersburg, Russia, email: makarov@gao.spb.ru
A.G. Tlatov
Affiliation:
Kislovodsk Solar Station of the Pulkovo Observatory, Russia, email: solar@narzan.ru
D.K. Callebaut
Affiliation:
Physics Dept., UA, University of Antwerp. B-2610, Antwerp. Belgium email: dirk.callebaut@ua.ac.be
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Abstract

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An analysis of polar activity of the Sun was carried out using the observations in the optical range. The secular and cycle peculiarities of the magnetic activity on the high latitudes were found:

  1. an increase of the area of polar caps of the Sun, occupied by unipolar magnetic field at the minimum activity during 1878-2000;

  2. a decrease of coronal temperature at the high-latitude zones during the last 50 years;

  3. the connection between the polar and sunspot activities;

  4. outset and duration of the polar activity cycle;

  5. drift of the activity to the poles and from the poles after the magnetic field reversal.

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Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS223 , June 2004 , pp. 49 - 56
Copyright
© 2004 International Astronomical Union