Atomic hydrogen and helium densities of the interstellar medium measured in the vicinity of the sun

Details Atomic hydrogen and helium densities of the interstellar medium measured in the vicinity of the sun Atomic hydrogen and helium densities of the interstellar medium measured in the vicinity of the sun

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160..229c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 2, May 1986, p. 229-242.

Astronomy and Astrophysics

Astrophysics

78

Gas Density, Helium Atoms, Hydrogen Atoms, Interplanetary Medium, Interstellar Gas, Solar System, Astronomical Spectroscopy, Extreme Ultraviolet Radiation, Gas Ionization, Venera 11 Satellite, Venera 12 Satellite, Venus Atmosphere

Scientific paper

Measurements of H I (121.6 nm) and He I (58.4 nm) resonance emission of the interplanetary gas have been obtained during the interplanetary cruise of Venera 11 and 12 spacecraft in 1978 - 1979 with an EUV spectrophotometer. Observations performed with the same instruments of H and He in the upper atmosphere of Venus during the flyby yielded the product of the calibration factor of the instrument by the exciting solar flux, allowing to measure with a minimal uncertainty the density of interstellar neutral hydrogen (nH = 0.065±0.010 cm-3) and helium (nHe = 0.0010±0.0045 cm-3) far from the sun but inside the heliopause. These results are discussed in terms of local interstellar medium ionization state.

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