Solar-cycle Time Delay of Rotating Sunspots

Details Solar-cycle Time Delay of Rotating Sunspots Solar-cycle Time Delay of Rotating Sunspots

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010acasn..51..272s&link_type=abstract

Acta Astronomica Sinica, vol. 51, no.3, p.272-277

Astronomy and Astrophysics

Astronomy

Sun: Activity, Sun: Sunspots, Methods: Data Analysis

Scientific paper

The statistical results indicate that the distribution of rotating sunspots varying with latitude and time in cycle 23 also shows the butterfly pattern. The changes of mean square errors among the four curve-fitting of second order for the two wings of the butterfly diagram of sunspots and the two wings of the butterfly diagram of rotating sunspots in cycle 23 with the phase are studied. The results are used to show a systematic time delay between northern and southern hemispheric sunspots activities in cycle 23, a systematic time delay between northern and southern hemispheric rotating sunspots activities in cycle 23, and a time delay between rotating sunspots and sunspots activities in the same hemispheres. It is confirmed that sunspots 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 sunspots activity in cycle 23, with southern hemispheric sunspots activity lagging behind northern hemispheric sunspots activity. It is also found that there is a phase shift between the butterfly diagram of rotating sunspots and the butterfly diagram of sunspots, with the butterfly diagram of rotating sunspots lagging behind the butterfly diagram of sunspots, and the lag is smaller than the theoretical result predicted by the solar dynamo model.

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