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Astron. Astrophys. 325, 828-838 (1997)

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Interstellar gas filtration to the inner heliosphere under the selfconsistent influence of a pick-up ion modulated termination shock

Th. , Kausch , H.J. and Fahr

Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany

Received 1 October 1996 / Accepted 18 March 1997

Abstract

In this paper we for the first time respect in terms of filtration properties the fact that the solar wind termination shock is likely to be a non-classical shock modulated by pick-up ions and anomalous cosmic ray particles. This type of shock produces a non-classical plasma interface between the inner heliosphere and the interstellar plasma with unusual thermodynamic properties like a cold and dense postshock solar wind plasma. We start out from the hydrodynamic description of the termination shock in a three-fluid approximation including the consistent dynamic interaction of the normal solar wind ion plasma, the heliospheric pick-up ions and the shock-generated, anomalous cosmic ray gas. Pick-up ions convected to the shock hereby serve as an effective seed for anomalous cosmic ray particles and strongly influence both location and nature of the shock and the post-shock plasma properties. On the other hand pick-up ions originate from interstellar neutral atoms penetrating into the inner heliosphere after passage over this post-shock plasma interface. By running an iterative computational procedure we arrive at a selfconsistent scenario. We present the neutral gas (H,O,N) and pick-up ion densities of this scenario and discuss these results in view of existing pick-up ion observations. Especially interesting are enhanced O- and N- pick-up ion densities within solar distances of 5AU resulting from reduced losses of O- and N-atoms in the post-shock interface.

Key words: shock waves – sun: solar wind – solar system: interplanetary medium – ISM: abundances, atoms, cosmic rays

Send offprint requests to: Th. Kausch

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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