Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsh24a..02h&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SH24A-02
Physics
2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2151 Neutral Particles (7837)
Scientific paper
Observational data of neutral atoms provides us with a 1 AU picture of the neutral atom flux in the heliosphere. The large mean free paths of neutrals allow us to infer properties of their distant source, as well as the properties of the intermediary medium. Energetic neutral hydrogen, for example, travels on almost straight trajectories, so that the particles observed coming from a particular direction were created from energetic protons along that line of sight. Similarly, low energy interstellar atoms are attenuated and deflected as they enter the heliosphere, and this deflection tells us something about the structure of the heliospheric interface. Of course, to infer quantitative features of the global heliosphere from neutral atom observations at 1 AU, we need accurate models that capture the 3D structure of the heliosphere. We will present an advanced MHD-neutral model of the heliosphere which is 3D, employs kinetic neutral Hydrogen, and incorporates a suprathermal tail on the solar wind proton distribution to approximate pick-up ions. We will demonstrate that with the help of such a model, we can test various hypotheses regarding the heliospheric boundary via forward modeling and comparison with data.
Heerikhuisen Jacob
Pogorelov Nikolai
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