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Interplanetary Lyman α Observations: Intensities from Voyagers and Line Profiles from HST/STIS

Clarke, John T.; Lallement, Rosine; Quémerais, Eric +1 more

We present an analysis of Voyager UVS data obtained between 1993 and mid-2007. These data are used to study the interplanetary background and the hydrogen number density in the outer heliosphere. Two types of observations are studied, first the heliospheric scans performed until 2003 and then the fixed line of sight observations, close to the upwi…

Constraints on the Structure of the Heliospheric Interface Based on Ly α Absorption Spectra

Wood, Brian E.; Izmodenov, Vladislav V.; Malama, Yury G.

Spectroscopic observations of the hydrogen Ly α lines from nearby stars taken by the Hubble Space Telescope (HST) sometimes show absorption signatures from the heliosphere. This absorption is a unique diagnostic of material in the outermost parts of our heliosphere. We summarize how the HST data have been used to test various models of the heliosp…