A Boltzmann-kinetic approach to describe the entrance of neutral interstellar hydrogen into the heliosphere

Details A Boltzmann-kinetic approach to describe the entrance of neutral interstellar hydrogen into the heliosphere A Boltzmann-kinetic approach to describe the entrance of neutral interstellar hydrogen into the heliosphere

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..260o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 260-269.

Astronomy and Astrophysics

Astrophysics

83

Boltzmann Transport Equation, Heliosphere, Hydrogen, Interstellar Matter, Solar Wind, Disturbances, Interstellar Magnetic Fields, Magnetohydrodynamic Flow, Numerical Integration

Scientific paper

The entrance of neutral interstellar hydrogen into the heliosphere is quantitatively described via a Boltzmann-kinetic approach. By a series expansion of the distribution function into consecutive charge exchange collision hierarchies, numerical solutions can be given for the resulting distribution function and its velocity moments, making it possible to show how the density, the temperature, and the bulk velocity of the interstellar hydrogen change at the advance of the gas towards the sun. Substantial differences between the velocity moments of interstellar hydrogen arriving at the upwind and at the downwind side of the solar system, respectively, can be noticed which shed new light on present-day problems in interpreting the heliospheric Lyman-Alpha resonance glow structures. The sensitivity of the upwind density profile with respect to various interface models is investigated and shown to yield, in the form of the upwind density gradient, an observational fact indicative for the actually present interface.

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