Computer Science
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..563m&link_type=abstract
In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:
Computer Science
Solar Cycle, Magnetic Field, Polar Magnetic Flux, Geomagnetic Activity, Maunder Minimum
Scientific paper
We calculated the area of polar zones of the Sun, Apz, occupied by unipolar magnetic field on Hα synoptic magnetic charts, following Makarov (1994), from 1878 to 2000. We found a gradual decrease of the annual latitude of the high-latitude zone boundaries of the global magnetic field of the Sun at the minimum of activity from 53° in 1878 down to 38° in 1996, yielding an average decrease of 1.2° per cycle. We found that the area of polar zones of the Sun Apz has risen by a factor of 2 during 1878-1996. The area of the unipolar magnetic field at high-latitudes Apz may be used as a new index of magnetic activity of the Sun. We compared Apz with the geomagnetic index and Wolf number. A temperature difference of about 1.3° between the Maunder Minimum and the present time was deduced. The causes of the waxing and waning of the Sun's activity in conditions like Maunder Minimum are discussed.
Callebaut Dirk K.
Makarov Valentin I.
Obridko Vladimir N.
Tlatov Andrej G.
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