Title
Large-scale magnetic field and sunspot cycles Large-scale magnetic field and sunspot cycles
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Dordrecht ,
Subject
Physics
Source (journal)
Solar physics. - Dordrecht
Volume/pages
198(2001) :2 , p. 409-421
ISSN
0038-0938
ISI
000168382700013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
H alpha magnetic synoptic charts of the Sun are processed for 1915-1999 and the spherical harmonics are calculated. It is shown that the polarity distribution of the magnetic field on H alpha charts is similar to the polarity distribution of the Stanford magnetic field observations during 1975-1999. The index of activity of the large-scale magnetic field A(t), representing the sum of the intensities of dipole and octupole components, is introduced. It is shown that the cycle of the large-scale magnetic field of the Sun precedes on the average by 5.5 years the sunspot activity cycle, W(t). This means that the weak large-scale magnetic fields of the Sun do not result from decay and diffusion of strong fields from active regions as it is supposed in all modern theories of the salar cycle. On the basis of the new data the intensity of the current solar cycle 23 is predicted and some aspects of the theory of the solar cycle are discussed.
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