Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2419b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2419-2425.
Physics
3
Cosmic Rays, Muons, Solar Activity Effects, Solar Cycles, Fractals, Heliosphere, Spectrum Analysis, Statistical Analysis
Scientific paper
The fractal and statistical properties of underground muons recorded at 570 hg/sq cm and their response to solar activity variations in the second part of solar cycle 21 are studied. A constant feature detected throughout the whole period considered is the self-affine nature of the underground muon fluctuations which display a scaling range extending approximately from a few hours to more than two months. The scaling and spectral exponents are positively correlated with the sunspot cycle. In addition, the intensity distribution shows a more marked presence of short- and long-term fluctuations near solar maximum. The presence of solar modulation in the muon record suggests dimensions of the heliosphere at least as large as a few scattering mean free paths of the 1.8-TV primaries.
Bergamasco L.
Castagnoli Cini G.
Kudriavtsev V. A.
Provenzale Antonello
Serio Manlio
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