The north-south asymmetry of sunspots

Details The north-south asymmetry of sunspots The north-south asymmetry of sunspots

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..540v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 540-546.

Astronomy and Astrophysics

Astrophysics

68

Magnetic Dipoles, Solar Activity Effects, Solar Cycles, Solar Flares, Sunspot Cycle, Asymmetry, Northern Hemisphere, Solar Magnetic Field, Solar Prominences

Scientific paper

An exhaustive study has been performed of the N-S asymmetry of sunspot areas during the period 1874-1976. The asymmetry of the yearly values is statistically significant; thus, the asymmetry is not due to random fluctuations. The highest values of the asymmetry coefficient are obtained around solar minimum. The change in the slope of the regression lines fitted to the yearly values of the asymmetry every four cycles in the cycles 12 to 21 suggests a long-term periodic behavior in the asymmetry around eight cycles in which the activity in one hemisphere is more important during the ascending branch of the cycle and becomes more important in the opposite hemisphere during the descending branch.

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