Seasonal Influence of Solar Activity on Cosmic Rays

Akande P. I[1]., Ekpe J. E[2]
Page no. 129-135

Cosmic ray intensity data and values of solar modulation potential (solar modulation parameter
for cosmic rays) of ten (10) years, for the month of June (typical month in the rainy season) and
December (typical month in the dry season) was obtained. The cosmic ray intensity of each year
was compared with the same ten (10) years values of solar modulation potential using a
statistical tool, for the two typical months. From the result, interpretation and understanding of the
statistical behavior, shows the relationship of solar activities with cosmic rays. There is a forbush
decrease, sudden decrease in cosmic ray intensity immediately the modulation of solar activity falls
in the year 2009.This means that changes in the solar activity or solar modulation can cause
changes in cosmic ray production in both rainy and dry season; and it gives impression that cosmic
rays can come from extrasolar astrophysical sources and/or the sun.