The Large-Scale Magnetic Field on the Sun: The Equatorial Region

Details The Large-Scale Magnetic Field on the Sun: The Equatorial Region The Large-Scale Magnetic Field on the Sun: The Equatorial Region

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44..103o&link_type=abstract

Astronomy Reports, Volume 44, Issue 2, February 2000, pp.103-111

Astronomy and Astrophysics

Astronomy

4

Scientific paper

The sector structure and variations in the large-scale magnetic field of the Sun are studied in detail using solar magnetic-field data taken over a long time interval (1915 1990). The two-sector and four-sector structures are independent entities (i.e., their cross correlation is very small), and they are manifest in different ways during the main phases of the 11-year cycle. The contribution of the two-sector structure increases toward the cycle minimum, whereas that of the four-sector structure is larger near the maximum. The magnetic-field sources determining the two-sector structure are localized near the bottom of the convection zone. The well-known 2 3-year quasi-periodic oscillations are primarily associated with the four-sector structure. The variations in the rotational characteristics of these structures have a period of 55 60 years. The results obtained are compared with the latest helioseismology data.

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