Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.9417r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A6, p. 9417-9431.
Physics
42
Galactic Cosmic Rays, Heliosphere, Solar Cosmic Rays, Transport Properties, Interplanetary Magnetic Fields, Solar Protons, Steady State
Scientific paper
Cosmic ray intensities and density gradients, as observed by the Pioneer 10 and 11, Voyager 1 and 2, and IMP spacecraft during the 1977 and 1987 solar minimum periods are interpreted via 2D, no-drift version of the cosmic ray transport equation that deepens insight into spectral shapes in the outer heliosphere, the question of anomalous hydrogen, and the properties of radial gradients. It is shown that many of these effects are due to adiabatic losses inherent in the modulation process. It is demonstrated that there is probably no physically realistic way to reproduce the observed negative latitudinal gradients without resorting to drift models of the modulation. The best fit to the anomalous oxygen data is achieved with either a charge state of 2(+), or with a source function that changes between solar minimum periods with a factor of 2.8.
McDonald Frank B.
Moraal Harm
Reinecke P. L. J.
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