Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ge%26ae..17..811m&link_type=abstract
Geomagnetizm i Aeronomiia, vol. 17, Sept.-Oct. 1977, p. 811-819. In Russian.
Astronomy and Astrophysics
Astronomy
1
Interplanetary Medium, Proton Energy, Solar Flares, Solar Protons, Alpha Particles, Astronomical Models, Diffusion Coefficient, Magnetic Effects
Scientific paper
The interplanetary propagation of protons with energies of 0.1 to 100 MeV, produced in the solar flare of August 7, 1972, is examined on the basis of Prognoz satellite measurements. Power-law diffusion coefficients are estimated for a model involving three-dimensional spherically symmetric diffusion. The proton injection spectrum and the power spectrum of interplanetary-magnetic-field (IMF) fluctuations are calculated, and it is found that the total flare energy released in the form of charged particles amounts to about 7%. The dependence of the diffusion coefficient on particle rigidity and heliocentric distance is investigated. The dependence of the relative amplitude of IMF fluctuations on heliocentric distance is shown to be characteristic of Alfven-wave damping. It is concluded that flare particle acceleration is governed by electric fields, possibly arising as a result of magnetic-field dissipation.
Likin O. B.
Morozova E. I.
Pisarenko N. F.
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