Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..47..435d&link_type=abstract
Astrophysics and Space Science, vol. 47, Apr. 1977, p. 435-445.
Astronomy and Astrophysics
Astrophysics
5
Cosmic Rays, Gas Ionization, Interplanetary Medium, Interstellar Gas, Astronomical Models, Energy Spectra, Mean Free Path, Radiation Spectra
Scientific paper
The origin of the cosmic-ray nucleon component in the energy interval from 1 to 30 MeV/amu, recently detected by space vehicles in interplanetary space, is investigated in detail. It is assumed that these particles may originate from nearby sources, e.g., from novae with peculiar CNO compositions. These particles are further assumed to be accelerated and modulated within the heliosphere. The charged states of these ions in interstellar space have been calculated in detail, and it is shown that the same charged states are preserved in the heliosphere when they are accelerated to energies of the order of 10 MeV/amu from energies of at least about 100 keV/amu. Modulation of these ions is calculated, and it is found that because of low charged states of the ions, these have high rigidities and are modulated in such a way as to enhance the O-ion abundances as compared with C ions. A comparison is made of the demodulated composition of the C to Si ions with available abundance data for some novae.
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