Sunspot groups at high latitude

Details Sunspot groups at high latitude Sunspot groups at high latitude

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.317..897l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 317, Issue 4, pp. 897-901.

Astronomy and Astrophysics

Astronomy

13

Sun: Activity, Sun: Evolution, Sunspots

Scientific paper

Data of sunspot groups at high latitude (>=35°), from the year 1874 to the present (2000 January), are collected to show their evolutional behaviour and to investigate features of the yearly number of sunspot groups at high latitude. Subsequently, an evolutional pattern of sunspot group number at high latitude is given in this paper. Results obtained show that the number of sunspot groups of a solar cycle at high latitude rises to a maximum value about 1yr earlier than the time of the maximum of sunspot relative numbers of the solar cycle, and then falls to zero more rapidly. The results also show that, at the moment, solar activity described by the sunspot relative numbers has not yet reached its minimum. In general, sunspot groups at high latitude have not appeared on the solar disc during the last 3yr of a Wolf solar cycle. The asymmetry of the high latitude sunspot group number of a Wolf solar cycle can reflect the asymmetry of solar activity in the Wolf solar cycle, and it is suggested that one could further use the high latitude sunspot group number during the rising time of a Wolf solar cycle, maximum year included, to judge the asymmetry of solar activity over the whole solar cycle.

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