The North-South asymmetry of solar activity

Details The North-South asymmetry of solar activity The North-South asymmetry of solar activity

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..201b&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

Computer Science

2

Coronal Green Line, Magnetic Fields, Solar Activity

Scientific paper

In the present paper the North-South (N-S) asymmetry of four solar activity indices is estimated and discussed. The coronal green line intensity measurements, the Wolf numbers and the sunspot area data - all of them were subjected to analysis over the 1943-1999 period, together with the NSO/KP data on the total magnetic field flux measured from 1975. The pair comparison of these four indices within different zones of solar latitude allowed to reveal a number of features in their mutual correlativness. As the coronal green line intensity as the sunspot area display a long-termed wave in their N-S asymmetry - about 40 years in duration. While during the first half of the interval studied the N-hemisphere dominates (with a clear maximum around 1964-66) then during the second half of the interval the activity measured over the S-hemisphere prevails. Quasi-biennial variations were identified both in the N-S asymmetry of the coronal green line brightness and that of the total magnetic flux. The performed study indicates a close relation between the global and local manifestations of solar activity, which are governed by the magnetic fields of different scales.

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