Penetration of interstellar hydrogen, oxygen and nitrogen atoms into the heliosphere through the solar wind-LIC interaction region

Details Penetration of interstellar hydrogen, oxygen and nitrogen atoms into the heliosphere through the solar wind-LIC interaction region Penetration of interstellar hydrogen, oxygen and nitrogen atoms into the heliosphere through the solar wind-LIC interaction region

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11c1124m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11C-1124

Physics

2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas, 2151 Neutral Particles, 2152 Pickup Ions, 2162 Solar Cycle Variations (7536)

Scientific paper

We report on our study of the filtration of interstellar atoms of hydrogen, oxygen and nitrogen in the interaction region between the solar wind and the local interstellar medium. Filtration has great importance for the determination of local interstellar abundances of these elements, which becomes now possible due to measurements of interstellar pickup ions by Ulysses, ACE and Cassini, and anomalous cosmic rays by Voyagers, Ulysses, ACE, SAMPEX and Wind. The filtration of the different elements depends on the level of their coupling with the plasma in the interaction region. We study the dependence of filtration on local interstellar proton and H atom number densities and evaluate the role of charge exchange and electron impact ionization on filtration. We explore the effects of electron temperature in the inner heliosheath on the filtration process. Using our filtration coefficients and recent SWICS/Ulysses pickup ion measurements we determine local abundances of oxygen and nitrogen in the local interstellar medium.

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