Understanding heliospheric structure: A comparison of multi-fluid, PIC kinetic, and Direct Simulation Monte-Carlo kinetic approaches to the modeling of neutral interstellar hydrogen

Details Understanding heliospheric structure: A comparison of multi-fluid, PIC kinetic, and Direct Simulation Monte-Carlo kinetic approaches to the modeling of neutral interstellar hydrogen Understanding heliospheric structure: A comparison of multi-fluid, PIC kinetic, and Direct Simulation Monte-Carlo kinetic approaches to the modeling of neutral interstellar hydrogen

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh43a1093z&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH43A-1093

Physics

2124 Heliopause And Solar Wind Termination

Scientific paper

The global structure of the heliosphere is very strongly influenced by the inclusion of interstellar neutral hydrogen. The charge exchange coupling of neutral hydrogen and plasma and the large charge exchange mean free path within the heliosphere ensure that the neutral hydrogen distribution is not equilibrated. Consequently, a simple single fluid model for the neutral hydrogen is inappropriate. We have developed three approaches to model the highly non-equilibrated neutral hydrogen distribution that interacts with the heliosphere: a multi-fluid model [Zank et al., 1996], a particle-in-cell kinetic approach [Mueller et al., 2000], and a Direct Simulation Monte-Carlo kinetic model [Heerikhuisen et al., 2004]. A detailed comparison of the three approaches is presented, and the limitations of the various techniques are discussed.

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