Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..48..267t&link_type=abstract
Astrophysics and Space Science, vol. 48, no. 2, May 1977, p. 267-281.
Astronomy and Astrophysics
Astrophysics
6
Cosmic Rays, Distribution Functions, Interplanetary Medium, Radiation Distribution, Lines Of Force, Magnetic Variations, Power Spectra, Radiant Flux Density
Scientific paper
The equation for the two-particle cosmic-ray distribution function is derived by averaging the Boltzmann kinetic equation. This equation is valid for an arbitrary ratio of regular and random components of the magnetic field. For low-energy particles the guiding-center approximation is used. On the basis of the derived equation, the relation between power spectra of cosmic-ray intensity and the random magnetic field is obtained. If power spectra are degree functions of high-energy particles (around 10 GeV/nucleon), the spectral index, nu, of the magnetic field lies between sigma and sigma-2, where sigma is the spectral index of the cosmic-ray power spectra. The experimental data concerning moderate-energy particles are in accordance with equality between nu and sigma, which demonstrates that the magnetic fluctuations are isotropic or the cosmic-ray spatial gradient is small near earth orbit.
Toptygin Igor N.
Vasilev V. N.
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