Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403.1115h&link_type=abstract
Astronomy and Astrophysics, v.403, p.1115-1121 (2003)
Astronomy and Astrophysics
Astrophysics
8
Sun: Magnetic Fields, Sun: Rotation
Scientific paper
New data on the mean magnetic field of the Sun (MMFS) as a star measured at the Crimean Astrophysical Observatory in 1998-2001 are presented. The 34-year time series of the MMFS using similar data from three other observatories (1968-2001, with the total number of daily MMFS values N = 12 428), is considered. It is found that (a) the primary synodic period of the equatorial rotation of solar magnetic field, Psun = 26.929 +/- 0.015 days, did not vary over the last 34 years, but (b) the average intensity H0 of the photospheric large-scale fields, by modulus, decreased by about 4.5% (with a confidence level of about 80%). The conclusion is made that the longer, 90-year, cycle might be responsible for this potential gradual decrease of H0. The average curve of MMFS variation as plotted with the primary rotational period Psun demonstrates an obvious N-S asymmetry of polarities, perhaps associated with the quadrupole component and ``magnetic disequilibrium'' of the Sun as a whole.
Haneychuk V. I.
Kotov Valerii A.
Tsap T. T.
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