Browse > Article
http://dx.doi.org/10.5303/PKAS.2002.17.1.015

THE RELATIVE SUNSPOT NUMBERS IN 2001  

SIM K. J. (한국천문연구원)
MOON Y.-J. (한국천문연구원)
LEE C. W (한국천문연구원)
CHANG B. H. (한국천문연구원)
KIM Y. H. (한국천문연구원)
KIM J. H. (한국천문연구원)
Publication Information
Publications of The Korean Astronomical Society / v.17, no.1, 2002 , pp. 15-22 More about this Journal
Abstract
We have analyzed 209 data of daily sunspot observations made during the period of January 3 to December 31 In 2001 and presented the daily relative sunspot numbers. During the year of 2001, our annual average of relative sunspot numbers is found to be 92.2. This number is obtained from the averaged daily number of 8.4 spot groups, in which there are about 57.5 distinct spots observed. According to the appearance of 370 spot groups, our analysis shows that the mean life time of spot groups is about 4 day and 20.4 hours.
Keywords
sunspot;
Citations & Related Records
연도 인용수 순위
  • Reference
1 심경진, 박영득, 1992, 천문학 논총 7, 255
2 심경진, 2000, 천문학 논총 15, 21
3 National Geophysical Data Center, 2001, Solar Geophysical Data, No. 689-691
4 Sim, K.J., Moon, Y.-J., Lee, C.-W., Chang, B.H. & Woo, H.S. 2001, JKAS, 34, 119
5 Sunspot Index Data Center, 2001, Sunspot Bulletin No. 1-12
6 Sunspot Index Data Center, 2001, News No. 3, 2002, News No. 1