The local interstellar helium density - Corrected

Details The local interstellar helium density - Corrected The local interstellar helium density - Corrected

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l..37f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 1, 1979, p. L37-L39.

Astronomy and Astrophysics

Astronomy

8

Gas Density, Helium, Interstellar Gas, Ultraviolet Astronomy, Abundance, Extremum Values, Far Ultraviolet Radiation, Neutral Gases

Scientific paper

An upper bound for the number density of neutral helium in the local interstellar medium of 0.004 + or - 0.0022 per cu cm was previously reported, based on extreme-ultraviolet telescope observations at 584 A made during the 1975 Apollo-Soyuz Test Project. A variety of evidence is found which indicates that the 584-A sensitivity of the instrument declined by a factor of 2 between the last laboratory calibration and the time of the measurements. The upper bound on the helium density is therefore revised to 0.0089 + or - 0.005 per cu cm.

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