The interplanetary hydrogen and helium glow and the inferred interstellar gas properties

Details The interplanetary hydrogen and helium glow and the inferred interstellar gas properties The interplanetary hydrogen and helium glow and the inferred interstellar gas properties

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nascp.2280.557j&link_type=abstract

In JPL Solar Wind Five p 557-563 (SEE N84-13067 03-92)

Computer Science

Helium, Hydrogen, Interplanetary Gas, Interstellar Gas, Interstellar Radiation, Luminance, Electromagnetic Scattering, Lyman Alpha Radiation, Pioneer 10 Space Probe, Solar Wind, Spatial Distribution

Scientific paper

Observations of the interplanetary hydrogen and helium glow have been obtained by a number of spacecraft and rocket experiments during the past fifteen years. Important results have been established on the temperature, density, velocity, spatial dependence, and hydrogen to helium ratio. However, only four spacecraft launched to date are investigating the outer solar system and of these four the Pioneer 10 spacecraft is the farthest out at 28 A.U. Observations from this spacecraft at great distances have permitted an improved analysis of the effects which are only evident at large distances from the Sun. Perhaps the most significant result in this regard is the clear evidence of the importance of multiple scattering of solar Ly-alpha; an effect which has not been observed in earlier work. Ignoring this effect can lead to a gross overestimate of the local galactic glow. Current best estimates of the galactic glow and the local interstellar wind parameters obtained by the Pioneer 10 photometer at great distances are presented, in addition to complementary experimental observations of particular interest.

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