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Session 18 - The Sun.
Display session, Monday, January 13
Metropolitan Ballroom,

[18.05] Observed Ly-alpha Absorption Suggests Barely Subsonic Heliospheric Inflow

K. Gayley, G. Zank, L. Pauls (Bartol Research Inst./ U. Delaware)

Detection of heliospheric absorption in GHRS spectra of nearby Ly-alpha sources allows for strong constraints on heliospheric models. We use such data toward alpha-Cen to confront sophisticated models that include the possibility of a subsonic heliospheric inflow. Our preliminary conclusion is that the Ly-alpha data most sensitively constrain the inflow Mach number, and that a Mach number near 0.9 provides the best fit, although a detailed parameter study is now needed.

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