First Results of a New Cosmic Ray Propagation Code

Details First Results of a New Cosmic Ray Propagation Code First Results of a New Cosmic Ray Propagation Code

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....4.1981b&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

1

Scientific paper

supernovae (SN) are considered as the most probable sources of Galactic cosmic rays (CR). While there is observational evidence that CR electrons are accelerated by these objects, there is still no unambiguous proof that cosmic ray nucleons are similarly produced in SNs. The main topic of our investigations is therefore to study the influence of the discrete nature, both in space and time, of this kind of CR sources on the nucleon CR propagation and on the spectrum measured at Earth. corresponding studies for CR electrons have been published before [10]. For this purpose, a new numerical code was developed, which is capable of dealing with three spatial dimensions and time with high resolution. The momentum pis treated as an additional free parameter. As there are not sufficient data for the gas distribution in the whole Galaxy, the gas distribution in the Galactic disc is assumed to be indep endent of the galacto centric radius, r, and of the azimuth, ϕ. In this case, it is possible to use a series ansatz in r and ϕ, that reduces the three-dimensional spatial problem to a set of one-dimensional equations in the perpendicular direction, z, which allows massive distributed computation.

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