Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..103f&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 103-117.
Astronomy and Astrophysics
Astrophysics
30
Flow Velocity, Interstellar Gas, Neutral Gases, Neutral Particles, Solar Wind, Elastic Scattering, Helium, Hydrogen, Stellar Winds, Velocity Distribution
Scientific paper
A method is presented for calculating exactly the velocity distribution function of neutral interstellar atoms at each location within a stellar system, taking into account both the effect of the stellar gravitational field and elastic collisions with stellar-wind protons. This method is based on the concepts of the Boltzmann equation and is not restricted to small-angle particle deflections. Attention is given to the collisionless distribution function, the thermal behavior of collisionless interstellar gas, the collision-dominated distribution function, and the gasdynamical properties of the collision-dominated gas fraction. The method is apparently applied to the case of the solar system, and results are obtained which indicate that all previously calculated first-order interplanetary-hydrogen densities at 1 AU for which the effect of elastic collisions had been neglected are too high by about 10% to 25%. The computations also show that interplanetary-hydrogen gas temperatures due to collisional heating effects range from 2600 to 7000 K at upwind to downwind orbital positions of earth and that helium at 1 AU attains a temperature of 2000 to 4500 K.
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