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Background magnetic fields during last three cycles of solar activity
Author(s) -
Andryeyeva O.A.,
Stepanian N.N.
Publication year - 2008
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200611003
Subject(s) - physics , gauss , magnetic field , solar observatory , magnetic flux , flux (metallurgy) , astrophysics , sunspot , sign (mathematics) , observatory , range (aeronautics) , solar cycle , computational physics , astronomy , solar wind , mathematics , mathematical analysis , materials science , quantum mechanics , metallurgy , composite material
This paper describes our studies of evolution of the solar magnetic field with different sign and field strength in the range from –100 G to 100 G. The structure and evolution of large‐scale magnetic fields on the Sun during the last 3 cycles of solar activity is investigated using magnetograph data from the Kitt Peak Solar Observatory. This analysis reveals two groups of the large‐scale magnetic fields evolving differently during the cycles. The first group is represented by relatively weak background fields, and is best observed in the range of 3–10 Gauss. The second group is represented by stronger fields of 75–100 Gauss. The spatial and temporal properties of these groups are described and compared with the total magnetic flux. It is shown that the anomalous behaviour of the total flux during the last cycle can be found only in the second group. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)