Velocity Distribution of Hydrogen Atoms toward the Solar Apex

Details Velocity Distribution of Hydrogen Atoms toward the Solar Apex Velocity Distribution of Hydrogen Atoms toward the Solar Apex

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh31a..03c&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH31A-03

Physics

3230 Numerical Solutions, 7837 Neutral Particles, 7859 Transport Processes, 2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas

Scientific paper

We present a new model of the two-dimensional velocity-space distribution of neutral hydrogen atoms along the solar apex. We solve a collisional Boltzmann transport equation that accounts for photo-ionization and charge exchange collisions with a background distribution of protons derived from a hydrodynamic simulation. A finite difference solution for a specialized velocity-space grid allows a detailed examination of the non-Maxwellian distribution of hydrogen for heliocentric distances up to 200 AU, including interesting streaming effects. We compare these results with a recent hybrid hydrodynamic/particle treatment of the interaction of the solar wind with the partially ionized local interstellar medium. Partially supported by the Thailand Research Fund, NFS award ATM-0078650, and NASA grants NAG 5-8134 and NAG 5-6469.

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