Cosmic rays in the heliosphere and cosmogenic nuclides

Details Cosmic rays in the heliosphere and cosmogenic nuclides Cosmic rays in the heliosphere and cosmogenic nuclides

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nugeo...9..273u&link_type=abstract

Nuclear Geophysics, Volume 9, Issue 3, p. 273-281.

Physics

Geophysics

1

Scientific paper

Radioactivity of cosmogenic nuclides in samples of extraterrestrial matter contain information on the intensity and energy spectrum of cosmic rays for different time periods (including those in the remote past), and for different regions of the heliosphere (including those at high latitudes). The elaborated analytical method of modelling nuclear reactions in cosmic bodies of different size and composition makes it possible to derive that information and, therefore, to study temporal and spatial variations of cosmic rays in the solar system over a long-time scale. Investigation of the cosmic ray variations presents, in its turn, an efficient tool for studying the electromagnetic structure of the heliosphere, as well as the sun dynamo operation. As follows from the cosmogenic nuclide evidence, the modulation range in the heliosphere is not spherical, but it is compressed in the meridional plane, mainly within the heliolatitude range ±40. At least up to 4 AU, the radial and latitudinal gradients of galactic cosmic rays with rigidity R > 0.5 GV strongly depend on the phase of the solar cycle; besides, the north-south asymmetry is ascertained. Some reduction of the modulation mechanism, perhaps due to stochastic processes in the sun entrails, is revealed for the period 2 6 million years ago.

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