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A relation between the short time variations of cosmic rays and geomagnetic field changeAn event is reported of approx. 37 min periodicity in cosmic ray intensity observed at Akeno(38 deg 47 N, 138 deg 30 E. 900m above s.l., cutoff 10.4 GV) during 1300 approx. 1900 UT on April 25th, 1984, just a day before Forbush decrease of April 26th. This event seemed to be followed by the periodic variations of the geomagnetic field observed at Kakioka (36 deg 23 N, 140 deg 18 E). The regression coefficient between them was obtained approx. 0.07%/10nT. It is shown that in general the power spectral density of cosmic rays in the frequency of 0.0001 approx. 0.001Hz correlates positively with the fluctuations of geomagnetic field (Dst field) around approx. 1.2x0.0001Hz. From the analysis of 47 days data (April 14th to June 13th, 1984) the regression curve was obtained as y=0.275x sup 0.343 with the correlation coefficient of 0.48, where x and y mean Fourier components of Dst field summed over 1.04 approx. 1.39x0.001Hz and cosmic ray power spectral density averaged over 0.0001 approx. 0.001Hz.
Document ID
19850026754
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Saki, T. (Nihon Univ. Shinei, Japan)
Kato, M. (Nihon Univ. Shinei, Japan)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: 19th Intern. Cosmic Ray Conf - Vol. 5
Subject Category
Space Radiation
Report/Patent Number
SH-5.1-14
Accession Number
85N35067
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850026678Collected WorksNineteenth International Cosmic Ray Conference. SH Sessions, Volume 5
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