Systematic Time Delay of Hemispheric Solar Activity

Details Systematic Time Delay of Hemispheric Solar Activity Systematic Time Delay of Hemispheric Solar Activity

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009soph..255..169l&link_type=abstract

Solar Physics, Volume 255, Issue 1, pp.169-177

Statistics

8

Sunspots, Statistics, Solar Cycle, Observations

Scientific paper

Five solar-activity indices - the monthly-mean sunspot numbers from January 1945 to March 2008, the monthly-mean sunspot areas during the period of May 1874 to March 2008, the monthly numbers of sunspot groups from May 1874 to May 2008, the monthly-mean flare indices from January 1966 to December 2006, and the numbers of solar filaments per Carrington rotation in the time interval of solar rotations 876 to 1823 - have been used to show a systematic time delay between northern and southern hemispheric solar activities in a cycle. It is found that solar activity does not occur synchronously in the northern and southern hemispheres, and there is a systematic time lag or lead (phase shift) between northern and southern hemispheric solar activity in a cycle. About an eight-cycle period is inferred to exist in such phase shifts. The activity on the Sun may be governed by two different and coupled processes, not by a single process.

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