Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icrc....2..251y&link_type=abstract
In: International Cosmic Ray Conference, 16th, Kyoto, Japan, August 6-18, 1979, Conference Papers. Volume 2. (A81-12386 02-93) T
Astronomy and Astrophysics
Astronomy
Astronomical Models, Cosmic Rays, Interstellar Space, Radiant Flux Density, Big Bang Cosmology, Galactic Structure, High Temperature Plasmas, Interstellar Matter, Meteoritic Composition, Ocean Bottom, Plasma Density, Radioactive Isotopes, Sediments
Scientific paper
It is shown that cosmic ray intensity should be enhanced by a factor of 2-3 in hot interstellar tunnels, assuming a modified cosmic ray confinement model that cosmic rays are confined in the galactic disk, as composed of interstellar tunnels and high density regions, and in a flat halo-type region spreading outside the galactic disk. Cosmic ray time variations are expected due to the encounters of the solar system with many hot tunnels during its long journey in the galaxy. Since the present solar system seems to be located near the center of a local hot tunnel with a radius of 100 pc, the cosmic ray flux might have increased by a factor of 2-3 about 5 my BP due to the encounter with this local tunnel. The possible examination of the model by measurements of cosmogenic radioactivities in meteorites and deep sea sediments is discussed.
Imamura Mineo
Yanagita Shohei
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