Study of high and low amplitude wave trains of cosmic ray diurnal variation during solar cycle 23 |
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Authors: | Ambika Singh Anil Kumar Tiwari S P Agrawal |
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Institution: | (1) Laboratory for High Energy Astrophysics, NASA/Goddard Space Flight Center, Greenbelt, Maryland, 20771;(2) The Department of Astronomy, University of Maryland, College Park, Maryland, 20742, U.S.A |
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Abstract: | A detailed study has been conducted on the long-term changes in the diurnal variation of cosmic rays in terms of high and
low amplitude wave trains event (HAEs/LAEs) during the period 1996–2008 (solar cycle 23), using the neutron monitor data from
Kiel neutron monitoring station. As such, 17 HAE and 48 LAE cases have been detected and analyzed. These HAEs appear quite
dominantly during the declining phase as well as near the maximum of the solar activity cycle 23. In contrast, the low amplitude
events (LAEs) are inversely correlated with solar activity cycle. In fact, LAEs appear quite dominantly during the minimum
phase of the solar activity. When we compare our results for diurnal phase with that observed on an annual average basis,
we notice no significant diurnal phase shift for HAEs as well as for LAEs. Moreover, we find that the high-speed solar wind
streams (HSSWS) do not play any significant role in causing these variations. These results are discussed on the basis of
that observed in earlier cycles. |
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