Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3839b&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
Measurements at the distant outer heliosphere by the Voyager spacecrafts show that galactic cosmic rays are still strongly modulated even close to the expected location of the termination shock. In this paper, we present a model calculation including the region of the heliosheath. By a simulation of particle trajectories using Markov sto chastic processes, we investigate the physical reason for the modulation of the flux of cosmic rays detected at the termination shock. Although the particles do not lose much energy in the heliosheath, the cosmic rays detected at the Voyagers have spent a significant amount of time sunward of the spacecraft in a region where adiabatic energy loss by the expanding solar wind is still significant. The model predicts that galactic cosmic rays measured outside the termination shock will still be modulated. The spacecraft have to get much farther out in order to directly measure the true interstellar spectrum of galactic cosmic rays.
Ball Bryan
Zhang Ming
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