Effect of Solar Output on Semi-diurnal Anisotropy of Cosmic Ray Intensity

Authors

  • Ambika Singh  Physics Department, S.B.S. Govt. P.G. College Pipariya, Madhya Pradesh, India

Keywords:

Daily variation of cosmic ray intensity, neutron monitor, solar cycle, solar magnetic cycle.

Abstract

Using the experimental data of the high counting rate neutron monitors, the semi-diurnal anisotropy of cosmic ray intensity has been investigated for the period 1965 – 2014 (solar cycles 20 to 24). The semi-diurnal amplitude shows negative correlation with the diurnal amplitude for the period 1965-2014, which may be due to the presence of significant modulation of semi-diurnal anisotropy with periods of 22 year sunspots magnetic cycle. For the semi-diurnal anisotropy, the phase is evenly distributed in the first and second quadrant. Observed semi-diurnal phase is maximum (~10h) during minimum phase of positive polarity (A>0). We also notice that in the even solar cycles (20 & 22) the annual average of semi-diurnal amplitude is generally maximum (near the solar activity minima) in its declining phase which are associated with high values of solar wind velocity and high values of semi-diurnal amplitude are observed during these periods. In contrast, the semi-diurnal amplitude is minimum in the declining phase (near the solar activity maxima). To highlight the effect, the average semi-diurnal amplitude and phase has been calculated (i) by grouping the years separately for solar cycles 20, 21, 22 ,23 & 24 as well as (ii) on the basis of polarity states of the solar magnetic field (A>0) is very significantly different from the other polarity state ( i.e. A<0).

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International Journal of Scientific Research in Science and Technology

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Published

2022-05-30

Issue

Volume 9, Issue 3, May-June-2022

Section

Research Articles

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How to Cite

[1]
Ambika Singh "Effect of Solar Output on Semi-diurnal Anisotropy of Cosmic Ray Intensity" International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011,Volume 9, Issue 3, pp.199-218, May-June-2022.