Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf..107q&link_type=abstract
Centre National de la Recherche Scientifique, International Solar Wind 8 Conference, p. 107
Astronomy and Astrophysics
Astronomy
Heliosphere, Hydrogen Atoms, Interstellar Gas, Lyman Alpha Radiation, Extraterrestrial Radiation, Ultraviolet Astronomy, Solar System, Plasmas (Physics), Radiative Transfer, Ultraviolet Spectrometers, Astronomical Models, Remote Sensing
Scientific paper
Since 1993, the Ultraviolet Spectrometers aboard both Voyager 1 and 2, were used to study the Ly-alpha glow pattern backscattered by neutral hydrogen atoms at great distance from the sun. When compared to a radiative transfer calculation for an unperturbed interstellar hydrogen flow into the solar system, the data present an excess of intensity seen in the direction of the incoming interstellar wind. An absolute estimate of this Lyman alpha intensity yields 10 to 15 Rayleighs for each spacecraft. We discuss the possibility that this excess is caused by a gradient of hydrogen at large distance from the Sun due to the filtration of interstellar hydrogen when crossing the heliopause. Comparisons with results from the Baranov-Malama model of neutral-plasma coupling at the heliopause are presented. The data yield a range of possible values for the hydrogen gradient which may be used to infer the location of the heliopause.
Bertaux Jean Loup
Lallement Rosine
Quémerais Eric
Sandel Bill R.
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