Bonn 2010 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 4: Heliosphere I

EP 4.4: Talk

Tuesday, March 16, 2010, 09:30–09:45, AKM

A multifluid approach to describe the plasma passage over the solar wind termination shock — •Hans Fahr and Sergei Chalov — Argelander Institute for Astronomy, Dept.Astrophysik, University of Bonn, Auf dem Huegel 71 , 53121

It is well known that the solar wind plasma at distances larger 30 AU is a multifluid phenomenon with different ion populations centered around different energies (i.e. around a few eV, KeV, and MeV). To treat the solar wind passage over the termination shock we use a three-fluid approach considering solar wind ions, pick-up ions and anomalous cosmic ray ions as independent fluids that are dynamically and thermodynamically coupled to eachother. In a consistent view of the shock transition presented on the basis of this multifluid concept we not only can give as compared to Voyager-2 measurements the right representation of the shock precursor, but also give correct representations of the downstream plasma temperatures and the supersonic signature of the downstream solar wind plasma. The latter fact is especially relevant in view of recently obtained IBEX ENA data.