Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1167b&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 8, Aug. 1992, p. 1167-1182.
Physics
Diurnal Variations, Muons, Sidereal Time, Solar Activity Effects, Fourier Analysis, Heliosphere
Scientific paper
Data on the sidereal variation of muons recorded at 570 hg/sq cm, corresponding to primary rigidities around 1.8 TV are presented. The record investigated covers a period of five years, from September 1985, near solar minimum, to September 1990, near solar maximum. The features of the observed sidereal variation histogram are related to the changing heliospheric conditions. It is concluded that the Fourier reconstruction of the 24-h histogram requires a large number of harmonics, since the first and the second (diurnal and semidiurnal) are often out-ranked by higher order Fourier harmonics. The anisotropy observed during the period of minimum solar activity has galactic origin. As the level of solar activity increases, the information on this anisotropy is altered by solar modulation processes.
Bergamasco L.
Castagnoli Cini G.
Kudriavtsev V. A.
Kuznetsov Alexander Vasilievich
Riazhskaia O.
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