Latitude Migration of Sunspot Groups

Details Latitude Migration of Sunspot Groups Latitude Migration of Sunspot Groups

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....122.2115l&link_type=abstract

The Astronomical Journal, Volume 122, Issue 4, pp. 2115-2117.

Astronomy and Astrophysics

Astronomy

13

Key Word: Sun

Scientific paper

Characteristics of latitude migration of sunspot groups in the northern and southern hemispheres are investigated by using the Royal Greenwich Observatory data set from the years 1874 through 1999. Latitude migration of sunspot groups is found to be represented by a binomial formula, which quantitatively describes the Spörer law. Latitude migration velocity of sunspot groups is largest at the beginning of a solar cycle, and as the solar cycle progresses, it decreases with time, with an average of about 1.6d yr-1 during a solar cycle. Two different methods have been employed to confirm that latitude migration in both hemispheres is statistically the same.

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