Velocity Distribution of Interstellar H Atoms in the Heliospheric Interface |
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Authors: | Vlad Izmodenov |
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Institution: | (1) Department of Aeromechanics, Faculty of Mechanics and Mathematics, Moscow State University, Moscow, 119899, Russia |
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Abstract: | In this paper we present first results of a numerical computation of the velocity distribution function of interstellar H
atoms in the heliospheric interface, the region of the solar and interstellar wind interaction. The velocity distribution
is a key tool to evaluate uncertainties introduced by various simplified models of the interface. We numerically solve the
kinetic equation for gas of H-atoms self-consistently with the hydrodynamic equations for plasma. Neutral and plasma components
are efficiently coupled by charge exchange. The interaction disturbs the atom velocity distribution, which is assumed to be
Maxwellian in the circumsolar local interstellar medium. It is shown that besides ‘original’ interstellar atoms, there are
three other important atom populations originating in the heliospheric interface. Velocity distribution functions of these
populations at the heliopause are presented and discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | |
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