Effects of a Radial Dependence in Transport Parameters on the Estimation of Solar Particle Fluence at Jupiter's Orbit

Details Effects of a Radial Dependence in Transport Parameters on the Estimation of Solar Particle Fluence at Jupiter's Orbit Effects of a Radial Dependence in Transport Parameters on the Estimation of Solar Particle Fluence at Jupiter's Orbit

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh33a1486s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH33A-1486

Physics

Plasma Physics

[2114] Interplanetary Physics / Energetic Particles, [7859] Space Plasma Physics / Transport Processes, [7984] Space Weather / Space Radiation Environment

Scientific paper

Solar energetic particles (SEPs) are one major hazard concern for astronauts in space missions, and their possible effects need to be evaluated before planning long-term missions such as eventual manned trips to Mars. Although particle transport between the Sun and the Earth is currently well understood, an accurate modeling technique for transport to larger distances is still needed in order to predict potential damage to spacecraft and crew by SEPs, especially during extreme events. A common consensus is that the pitch-angle scattering radial mean free path can be assumed to be constant, but new results in simulations of solar wind turbulence suggest that there is a dependence on distance to the Sun. In this work we model the radial transport of SEPs in the inner heliosphere and out to the orbit of Jupiter by specifying a different radial dependence for the pitch-angle scattering mean free path. We estimate time profiles and fluence at different distances from the Sun for different particle energies, and compare the results with those corresponding to the previous assumptions. Partially supported by the Thailand Research Fund and NASA's Living With a Star program under grant NNX08AQ18G.

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