The Relative Sunspot Numbers in 1998

Details The Relative Sunspot Numbers in 1998 The Relative Sunspot Numbers in 1998

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pkas...14..113s&link_type=abstract

Publications of the Korean Astronomical Society, vol. 14, no. 2, pp. 113-121

Astronomy and Astrophysics

Astronomy

Sunspot

Scientific paper

We have analyzed 251 data of the daily sunspot observations during the period of January 3 to December 31 in 1998 and present the daily relative sunspot numbers. During the 1998, the preliminary annual average of the relative sunspot numbers is found to be 84.8 based on 26.6 distinct spots in a single group for 4.6 spot groups. According to the appearance of 286 spot groups, our analysis shows that the mean life time of spot group is about 4 day and 23.6 hours.

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