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dc.contributor.authorSharma, R M-
dc.contributor.authorNigam, S K-
dc.contributor.authorSingh, R L-
dc.contributor.authorAgrawal, S P-
dc.identifier.issn0975-105X (Online); 0367-8393 (Print)-
dc.description.abstractLong-term variability of the daily variation of cosmic ray intensity is discussed in terms of two hypotheses: the 22-yr field-aligned sinusoidal wave proposed by S E Forbush [J. geophys. Res., 74 (1969), 3451] and the radial or field-aligned anisotropy mainly effective during alternate sunspot cycle superimposed on normal corotational anisotropy. As expected, no evidence is found for a positive cycle of 22-yr wave around 1964-65 minima as well as of complete phase reversal in diurnal vector even for a complete solar rotation in 1976 in contrast to that in 1954 at neutron monitor energies. Comparison of diurnal and semidiurnal variations with the available solar wind velocity measurements provide further evidence of significant changes since 1971and better understanding of the nature of semi-diurnal anisotropy. It is shown that the semi-diurnal anisotropy observed during days of higher Ap index may not be due to extra-terrestrial effect but of local origin.en_US
dc.publisherNISCAIR-CSIR, Indiaen_US
dc.rights CC Attribution-Noncommercial-No Derivative Works 2.5 Indiaen_US
dc.sourceIJRSP Vol.07(4) [August 1978]en_US
dc.titleAverage Anisotropy Characteristics of High Energy Cosmic Ray Particles Approaching Solar Minimumen_US
Appears in Collections:IJRSP Vol.07(4) [August 1978]

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