Berlin 2014 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 8: Sonne und Heliosphäre (II)

EP 8.8: Vortrag

Freitag, 21. März 2014, 12:30–12:45, DO24 1.103

The entropy production at the multi-fluid MHD solar wind termination shock — •Hans Jörg Fahr and Mark Siewert — Argelander Institut für Astronomie, Universität Bonn, Auf dem Huegel 71, 53121 Bonn

It has become evident meanwhile that the MHD solar wind termination shock needs a multifluid theoretical approach to adequately describe the intertwisted physical complexity in the interaction between fields and particles. In this approach here we treat the passage of three separate fluids over the MHD shock, namely solar wind protons, pickup protons and electrons. Connected with the different downstream pressures of three fluids we also calculate the different fluid entropies that are produced at the shock passage. As we can show the most relevant contribution to the total particle entropy is connected with the electron pressure which actually by far dominates the downstream plasma pressure.