Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..389c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 389-393. Research supported by the Fulbright Foundat
Astronomy and Astrophysics
Astrophysics
23
High Dispersion Spectrographs, Interplanetary Space, Interstellar Gas, Iue, Lyman Alpha Radiation, Solar Spectra, Background Radiation, Brightness Distribution, Emission Spectra, H Lines, Heliosphere, Spectrophotometry, Wind Velocity
Scientific paper
IUE high dispersion spectra of resonantly scattered solar Ly alpha emission from H moving into the solar system with the local interstellar wind are reported which are based on observations conducted in April 1981 and April 1983. A heliocentric velocity of -29 + or - 5 km/s has been observed from the ISW component along with a surface brightness which has decreased from about 1000 to 800 Rayleighs over the two-year interval. A preliminary derivation of the velocity of the ISM at large distances from the sun yields a value of 25.6 + or - 5 km/s.
Bowyer Stuart
Clarke John T.
Fahr Hans Jörg
Lay Gary
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