Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5909m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #59.09; Bulletin of the American Astronomical Society, Vol. 39, p.842
Astronomy and Astrophysics
Astronomy
Scientific paper
The local ISM interacts with the solar wind to create the heliosphere and a hydrogen overdensity (wall) slower than the ISM which is detectable in high-resolution HST Lyman alpha spectra. Numerical simulations of this system use typical solar wind input as inner boundary condition, and local ISM parameters as the outer boundary. The latter are not very well constrained, and so a parameter study is undertaken to probe the range of allowable ISM values. The sensitivity of the extra, heliospheric (foreground) HI column density to the local ISM conditions is presented. The inferred absorption depends strongly on ISM neutral H density, less strongly on ISM electron density, and only weakly on the ISM temperature. In principle, this type of matching models to observations constrain the ISM conditions.
Mueller Hans
Wood Brian E.
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