Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-05
Astronomy and Astrophysics
Astrophysics
10 pages, accepted for publication in JGR-Space Physics
Scientific paper
In this paper, we study heliospheric Ly-$\alpha$ absorption toward nearby stars in different lines of sight. We use the Baranov-Malama model of the solar wind interaction with a two-component (charged component and H atoms) interstellar medium. Interstellar atoms are described kinetically in the model. The code allows us to separate the heliospheric absorption into two components, produced by H atoms originating in the hydrogen wall and heliosheath regions, respectively. We study the sensitivity of the heliospheric absorption to the assumed interstellar proton and H atom number densities. These theoretical results are compared with interstellar absorption toward six nearby stars observed by the Hubble Space Telescope.
Izmodenov Vladislav V.
Lallement Rosine
Wood Bernard
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