Estimate of interstellar helium parameters from Prognoz 6 and Voyager 1/2 - EUV resonance glow measurements taking into account a possible redshift in the solar line profile

Details Estimate of interstellar helium parameters from Prognoz 6 and Voyager 1/2 - EUV resonance glow measurements taking into account a possible redshift in the solar line profile Estimate of interstellar helium parameters from Prognoz 6 and Voyager 1/2 - EUV resonance glow measurements taking into account a possible redshift in the solar line profile

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201..113c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 1, July 1988, p. 113-122.

Computer Science

Sound

27

Extreme Ultraviolet Radiation, Helium, Interstellar Gas, Red Shift, Satellite Sounding, Solar Spectra, Heliosphere, Prognoz Satellites, Ultraviolet Spectra, Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

Voyager 1 and 2 observations at 58.4 nm are used to reanalyze the He I 58.4 nm interplanetary resonance glow measurements made by two EUV photometers aboard Prognoz 6. It is shown that model fitting using a low temperature (7000 + or - 2000 K) and velocity (21.5 + or - 2.5 km/s) resolves several contradictions concerning the physics of the coupling between neutrals and protons at the heliopause and the comparison with independent measurements of the solar line width. New solar parameter values of 36 + or - 6 km/s for the solar line half width at 1/e, 9 + or - 3 km/s for the redshift of the solar line, and 1.4 (+ 0.6 - 0.3) x 10 to the 7th for the lifetime are proposed. It is pointed out that if the redshift assumption is valid, a weak differentiation between helium and hydrogen at the heliospheric interface is implied.

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