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标题：Variations of Upper Cut-off Rigidity of Cosmic Ray Diurnal Anisotropy
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作者：AMBIKA SINGH ; DIVYA DUBEY ; RUKMANI PRATAP SINGH 等
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2013
卷号：2
期号：9
页码：4648
出版社：S&S Publications
摘要：Using the experimental data of the high counting rate neutron monitor, the solar diurnal anisotropy of galacticcosmic rays has been investigated for the period 1986-2006.The most probable value of the upper cut-off rigidity of thediurnal variation shows a 22- years magnetic cycle variations with the lowest value at the sunspot minima of A>0 phase.Upper cut-off rigidity in solar cycle 22 and 23 is found to vary between 40 GV to about 100 GV. This is derived by usingthe minimum variance analysis between a few high and low latitude stations by including the set of variation coefficients.The derived amplitude of the diurnal anisotropy (in space) varies with a period of one solar activity (11-year cycle,whereas, the phase of the diurnal anisotropy displays an obvious 22-year magnetic cycle.
关键词：Cosmic ray; Diurnal variation; Solar cycle; Solar magnetic cycle; Cut-off rigidity