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Astron. Astrophys. 337, 859-865 (1998)


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Decaying cosmic ray nuclei in the local interstellar medium

V.S. Ptuskin 1 and A. Soutoul 2

1 Institute for Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences, Troitsk, Moscow Region 142092, Russia
2 DSM/DAPNIA/SAp, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France

Received 4 March 1997 / Accepted 19 January 1998

Abstract

Secondary radioactive isotopes that are used for the determination of cosmic ray age, have relatively short decay lifetimes. The measured abundance of these isotopes at low energies is representative of the cosmic ray diffusion and the gas distribution in a region of a few hundred parsecs around the Sun. We show how to determine the local cosmic ray diffusion coefficient in the Galaxy using the data on decaying cosmic ray nuclei.

Key words: cosmic rays – ISM: general


© European Southern Observatory (ESO) 1998

Online publication: August 27, 1998

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