The Relative Sunspot Numbers in 1993

Details The Relative Sunspot Numbers in 1993 The Relative Sunspot Numbers in 1993

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pkas....8..153s&link_type=abstract

Publications of the Korean Astronomical Society, vol.8, no.1, p.153-161

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze 211 data of the daily sunspot observations during the period of January 4 to November 30 in 1993 and present the daily relative sunspot numbers. During 334 days of the period, the preliminary annual average of the relative sunspot numbers is found to be 61.8 based on 27.1 distinct spots in a single group for 3.7 spot groups. According to the appearance of 203 spot groups, our analysis shows that the mean life time of spot group is about 1 day and 15.5 hours. Our records show that more number of sunspots have appeared in the southern hemisphere than in the northern hemisphere by some 2%, indicating that the solar activities of the northern and southern hemispheres are much the same during the period.

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