Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh14a1695h&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH14A-1695
Physics
2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2151 Neutral Particles (7837)
Scientific paper
The flow of the solar wind plasma carves out the heliosphere, and creates a large scale region of interaction between itself and the interstellar medium. Although the solar wind and interstellar plasmas do not mix -- they are instead separated by a contact discontinuity known as the heliopause -- neutral hydrogen atoms of interstellar origin flow freely through the entire region. Charge-exchange weakly couples the plasma and neutral gasses, and this process leads to a significant cooling and shrinking of the heliosheath compared with a plasma-only model). Secondary neutral atoms produced in the solar wind by this process may travel back into the interstellar medium and deposit their energy upon further charge-exchange. Models of the heliosphere have traditionally included neutral hydrogen atoms either kinetically or as a fluid, and coupled these to the plasma through charge-exchange. Charge-exchange collisions, however, represent a limiting case of a more general H-p collision, where particle momentum interchange exactly. In this poster we compare this commonly used approximation with an approach which utilizes the differential cross-section. We will present a detailed analysis of the ion and neutral distributions, along with comparisons of the overall heliospheric structure in axially symmetric geometry.
Heerikhuisen Jacob
Kharchenko Vasili
Zank Gary P.
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