Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21b1608m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21B-1608
Physics
2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2151 Neutral Particles (7837), 7833 Mathematical And Numerical Techniques (0500, 3200)
Scientific paper
Recent results from the Voyager termination shock crossings, and the interpretation of the forthcoming IBEX measurements, underscore the necessity to understand and accurately model neutral hydrogen throughout the heliosphere, and the consequent production of pickup ions in the inner heliosphere and energetic neutral atoms in the heliosheath. The neutral distribution functions at the termination shock are necessary as boundary input for detailed models of the inner heliosphere. In this contribution, the termination shock is characterized with the help of a global heliospheric multi-fluid model; its distance, shock strength, and downstream effective temperature change as a function of angle from the stagnation axis. The neutrals crossing the termination shock (both outbound and inbound) are characterized and decomposed into components of different heliospheric origin. With this information taken as an outer boundary, the modeling of the neutral particle distributions in the region of the supersonic solar wind (inner heliosphere) is taken over by a trajectory and ionization-losses simulation that interfaces at the termination shock with the multi-fluid model. The latter is responsible for modeling the heliosphere from the termination shock outwards. The neutral distribution functions in the inner heliosphere are found to be complex, and deviate from the often- used "hot model" of heliospheric neutrals.
Bzowski Maciej
Moebius Eberhard
Mueller Hans-Reinhard
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