Background magnetic fields during last three cycles of solar activity

Details Background magnetic fields during last three cycles of solar activity Background magnetic fields during last three cycles of solar activity

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008an....329..579a&link_type=abstract

Astronomische Nachrichten, Vol.329, Issue 6, p.579-582

Astronomy and Astrophysics

Astronomy

1

Sun: Activity, Sun: Magnetic Fields

Scientific paper

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

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