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International Journal of Scientific and Research Publications, Volume 3, Issue 2, February 2013 633
ISSN 2250-3153
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Fig.7: Graph of month vs. monthly sunspot mean for cycle 22
D. CYCLE 21
Fig.-8 showing the data from January 1976 to December 1986 is
taken for study. The average of daily values of sunspot numbers
from January 1976 to December 1986 is obtained as 78. Average
of successive peak values is4.66 months. Midrange periodicity of
140 ± 8 days is obtained.
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Fig.8: Graph of month Vs monthly sunspot mean for cycle 21
IV-CONCLUSION
In this paper, we analyzed the periodicity of the sun spot number
and four different cycles are analyzed for midrange periodicity.
Analysis of the data reveals that the existence of 11 year
periodicity of sunspot cycle and midrange periodicities of 140 ±
8, 95 ± 8, 107 ± 6 and 137 ± 2 days exist in solar cycles 21, 22,
23 and 24 respectively.
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