Comparison of Solar Cycle 24 with 3 Previous Cycles in respect of Sunspot Number Data

Select Volume / Issue:

• Volume 12, Issue 5, Sept. 2024

Year:

2024

Type of Publication:

Article

Keywords:

Solar Cycle 21, Solar Cycle 22, Solar Cycle 23, Solar Cycle 24, Sunspot Number

Authors:

Debojyoti Halder

Journal:

IJISM

Volume:

12

Number:

5

Pages:

22-25

Month:

September

ISSN:

2347-9051

Abstract:

Solar cycle 24 is the most recently completed solar cycle, the 24th since 1755, when extensive recording of solar sunspot activity began. It began in December 2008 and ended in December 2019. Activity was minimal until early 2010. It reached its maximum in April 2014 with a 23 months smoothed sunspot number of 81.8. This maximum value was substantially lower than previous three solar cycles. In this paper, a thorough analysis of all the sunspots appeared during the complete period has been done carefully and the daily sunspot numbers against their appearing dates for each solar cycle have been plotted. It appears that the sunspot activity has been on the lower side for solar cycle 24 when compared to the three previous solar cycles - cycle 21,22 and 23.

Full text: IJISM_1011_FINAL.pdf [Bibtex]