Rigidity spectrum of Forbush decrease

Details Rigidity spectrum of Forbush decrease Rigidity spectrum of Forbush decrease

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....5..238s&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5 p 238-241 (SEE N85-34991 23-93)

Physics

Cosmic Rays, Energy Spectra, Forbush Decreases, Statistical Analysis, Flux (Rate), Flux Density, Least Squares Method, Muons, Neutron Counters, Neutrons, Solar Activity

Scientific paper

Using data from neutron monitors and muon telescopes at surface and underground stations, the average rigidity spectrum of Forbush decreases (Fds) during the period of 1978-1982 were obtained. Thirty eight Ed-events are classified into two groups Hard Fd and Soft Fd according to size of Fd at Sakashita station. It is found that a spectral form of fractional-power type (P to the-gamma1 (P+Pc) to the -gamma sub2) is more suitable for the present purpose than that of power-exponential type or of power type with an upper limiting rigidity. The best fitted spectrum of fractional-power type is expressed by gamma sub1 = 0.37, gamma sub2 = 0.89 and P subc = 10 GV for Hard Fd and gamma sub1 = 0.77, gamma sub2 = 1.02 and Pc - 14GV for Soft Fd.

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