Heliospheric Foreground Ly-alpha Absorption: Sensitivity To Local Interstellar Conditions

Details Heliospheric Foreground Ly-alpha Absorption: Sensitivity To Local Interstellar Conditions Heliospheric Foreground Ly-alpha Absorption: Sensitivity To Local Interstellar Conditions

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348514m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #485.14; Bulletin of the American Astronomical Society, Vol. 41, p.457

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. A parameter study probing the range of allowable ISM values is presented. The extra, heliospheric (foreground) HI column density 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 constrains the local ISM conditions.

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