Gamma-ray production in stellar winds by galactic and local cosmic rays and application to the heliosphere

Details Gamma-ray production in stellar winds by galactic and local cosmic rays and application to the heliosphere Gamma-ray production in stellar winds by galactic and local cosmic rays and application to the heliosphere

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4..111d&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

The interaction of cosmic ray (CR) particles (protons, nuclei and electrons) with stellar wind matter determines the main processes of high-energy gamma ray generation through neutral pion decay and bremsstrahlung emission. These processes depend on the space-time distribution of stellar wind matter, as well as on the space-time distribution of CR energy spectrum and content. By solving self-consistent spherical-symmetric problem for stellar wind region (by taking into account energetic particle pressure influence on stellar wind plasma propagation and energetic particle kinetic stream instability influence on small-scale magnetic plasma structure), we evaluate galactic CR modulation in the star near space in dependence on the level of stellar activity, on the radial distance, on the particle energy, as well as on plasma density space-time distribution. By these results we evaluate an expected gamma-ray emission from galactic CR and gamma-ray fluxes in dependence on direction for a local observer (Heliosphere) and distant observer (stars). Then, it can be evaluated the expected gamma-ray fluxes from solar CR for great flare energetic particle events and from stars caused by local CR interactions with stellar wind matter.

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