NDLI: Towards a Better Understanding of a Hydrodynamic Plasma-Gas Coupling by Charge Exchange Processes

Content Provider	Springer Nature Link
Author	Fahr, Hans J.
Copyright Year	2003
Abstract	Previous models of the interaction of the solar and interstellar hydrodynamic flows have clearly recognized the need to correctly describe the charge-exchange induced coupling of these flows. Neutral atoms and protons are coupled by mass-, momentum-, and energy- exchange terms due to charge exchange collisions between ionized and neutral particle species. However, treating as implified case of this problem, namely the penetration of an H-atom flow through the plasma wall ahead of the heliopause, we demonstrate that the exchange terms previously used in hydrodynamic treatments lead to a singularity with an O-type critical point at the sonic point of the H-atom flow. At this point a continuous integration of the hydrodynamic set of differential equations is impeded. We show that the remedy of this problem is given by a more accurate formulation of the momentum exchange term for the regime of quasi- and sub-sonic H-atom flows. Using a momentum exchange term derived from basic kinetic Boltzmann principles we now obtain a characteristic equation with an X-type critical point which allows to present a continuous solution from supersonic to subsonic flow conditions. Under these new auspices the already often treated problem of the penetration of interstellar H-atoms into the inner heliosphere has urgently to be revisited, since H-atoms are more effectively decelerated at their penetration into the inner heliosphere and are more strongly deflected to the flanks of the heliopause.
Starting Page	1035
Ending Page	1054
Page Count	20
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	284
Issue Number	3
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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