Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0479m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0479
Other
2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas, 2151 Neutral Particles, 2152 Pickup Ions
Scientific paper
The global structure of the heliosphere is determined by the interaction of the solar wind and the partially ionized local interstellar medium (LISM). The presence of neutral interstellar hydrogen, because it is the most abundant particle species, plays an essential role in determining the global heliospheric morphology. Like neutral hydrogen, heavy interstellar atoms respond through charge-exchange coupling to the heliosphere and the LISM-heliosphere boundaries in an often complex way. We use kinetic models that include heavy elements such as He, C, N, O, and others, to study the heliospheric distribution of neutrals and the singly charged ions of these species, besides H. We describe the evolution of heavy neutral atom distributions throughout the heliosphere, and include the interaction of heavy particles with neutral hydrogen and protons through charge exchange (i.e., the creation of pickup ions), and of course the heavy neutrals are subject to photoionization and gravity. We use improved, recently published charge exchange cross-sections as well as recently identified LISM boundary conditions. A realistic description of the basic heavy element distribution will provide an important theoretical basis for interpreting observations of pickup ions made by Ulysses and ACE.
Mueller Holger
Zank Gary P.
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