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Research Article

Academia Journal of Scientific Research 7(10): 538-541, October 2019
DOI: 10.15413/ajsr.2019.0149
ISSN: 2315-7712
2019 Academia Publishing 

Abstract

 


Heliospheric modulation of cosmic rays for the past five solar cycles
 

Accepted 7th February 2019

 
Vivian Akaogu

Physics Department, Rivers State University, Port Harcourt, Nigeria.
 

This study aimed at determining the extent at which solar activity moderated the influx of cosmic rays into the earth surface for the past five solar cycles (20, 21, 22, 23 and 24). A detailed correlative study was done using the values of the monthly mean of Sunspot number (SSN) and that of cosmic rays from four different stations. The statistical analysis of the data depicts a very high correlation between solar activity and cosmic rays for most of the periods under study, which is consistent with earlier findings. However, a slightly lower correlation coefficient (r) was observed in solar cycle 21 in all the stations. A very strong correlation coefficient of ≈0.9 in solar cycle 22 was also noticed in all the stations. Our result suggests that level of statistical association between solar activity and cosmic rays varies from one cycle to the other. One would have assumed a uniform value of r for the five solar cycles, but that was the case. The reason for this variation in the depth of modulation for different solar cycles is uncertain and as such calls for further investigation.

Key words: solar activity, cosmic rays, solar cycles, earth surface.
 

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Cite this article as:

Akaogu V (2019). Heliospheric modulation of cosmic rays for the past five solar cycles. Acad. J. Sci. Res. 7(10): 538-541.

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