Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157....3f&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
2
Emission Spectra, Iue, Lyman Alpha Radiation, Ultraviolet Astronomy, Error Analysis, Geocoronal Emissions, Hydrogen, Interplanetary Gas, Resonance Scattering
Scientific paper
An emission line at 1216 A is noticeable in International Ultraviolet Explorer spectra for exposure times longer than about 5 minutes in low dispersion. For a set of seven sky-only spectra the expected Lyman alpha column emission rate was calculated from standard models of geocoronal and interplanetary hydrogen. The geocorona contributes between 5% and 50% of the signal, depending on the observing geometry. The calculated emission rates are higher than the observed ones by approximately 19% with a scatter of 11%. This discrepancy is smaller than the combined errors of observation and calculation.
Fricke Karl-Heinrich
Ojanguren O.
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