Anisotropies of anomalous and galactic cosmic rays upstream and downstream of the termination shock

Details Anisotropies of anomalous and galactic cosmic rays upstream and downstream of the termination shock Anisotropies of anomalous and galactic cosmic rays upstream and downstream of the termination shock

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh12c..07z&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH12C-07

Physics

2104 Cosmic Rays, 2124 Heliopause And Solar Wind Termination, 2164 Solar Wind Plasma

Scientific paper

Anisotropies of low-energy anomalous and galactic cosmic rays observed in the heliosphere can come from the Compton-Getting effect, particle diffusion and gyration effect associated with particle density gradient. When the spacecraft is connected to the particle source at the termination shock by magnetic field lines within a few particle mean free paths, particle streaming may also contribute to the anisotropy. A straightforward determination of solar wind speed based on the simple assumption that the anisotropy comes from the Compton-Getting effect may derive an incorrect value. This is particularly true near and upstream the termination shock where the particle gradient could be large enough to yield a diffusive anisotropy that cancels the Compton-Getting effect. In this paper, we present the results of a calculation of anomalous and galactic cosmic ray anisotropy using a heliospheric model that includes the termination shock and a heliosheath. Comparison with recent Voyager observations at 85-89 AU will be discussed. This work was supported in part by NASA Grant NAG5-11036.

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