Implications of the observations of partially ionised states in the low energy galactic cosmic raysOf the low energy (30-100 MeV/N)Fe-group nuclei of Galactic cosmic rays (GCRs) a fraction of about 20 percent of these are in partially ionized states. The origin of these particles are not known at present. From the considerations of relevant cross-sections, the following two important processes of the phenomena are given: (1) these GCR Fe-group nuclei must have captured the orbital electrons at energies of 1-5 MeV/N, while traversing matter; and (2) that these GCR ions of 1-5 MeV/N are then reaccelerated to energies of at least 30-100 MeV/N, most probably in the heliospheric boundary region. Three possible scenarios of the electron-capture processes are briefly discussed: (1) electron capture in a large molecular cloud; (2) GCR equilibrium spectra in ISM and their equilibrium charge; and (3) electron capture in the Oort's cloud.
Document ID
19920054193
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mitra, Banashree (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Biswas, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Durgaprasad, N. (Tata Institute of Fundamental Research Bombay, India)
Dutta, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Goswami, J. N. (Physical Research Laboratory Ahmedabad, India)
Ramadurai, S. (Tata Institute of Fundamental Research Bombay, India)