The spectrum of the Jovian dayglow observed at 3 A resolution with the Hopkins ultraviolet telescope

Details The spectrum of the Jovian dayglow observed at 3 A resolution with the Hopkins ultraviolet telescope The spectrum of the Jovian dayglow observed at 3 A resolution with the Hopkins ultraviolet telescope

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..279f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 279-284.

Astronomy and Astrophysics

Astronomy

39

Dayglow, Electron States, Jupiter Atmosphere, Lyman Spectra, Ultraviolet Spectra, Ultraviolet Telescopes, Hydrogen, Iue, Solar Radio Emission, Spaceborne Astronomy, Jupiter, Dayglow, Spectra, Ultraviolet, Wavelengths, Spectroscopy, Space Shuttle Observations, Hut Instrument, Description, Comparison, Voyager Missions, Uvs Instrument, Hydrogen, Emissions, Fluorescence, Analysis, Lyman-Alpha Radiation, Electrons, Excitation, Intensity, Equatorial Region, Luminosity, Impact Effects

Scientific paper

Ultraviolet spectra of the Jovian equatorial dayglow in the spectral range 830-1850 A were obtained at about 3 A resolution. The observed spectrum is dominated by electron impact excitation of the H2 Lyman and Werner band systems. Solar Lyman-beta induced fluorescence in the (6, nu-double prime) Lyman band progression is clearly identified in five distinct P(1) lines, and the contribution of solar fluorescence to the total 2.3 kR slit-averaged H2 emission rate is estimated to be 17-22 percent. The electron excitation spectrum is characterized by a relative weakness of the Werner band system and the absence of cascade contributions to the Lyman system and is very similar to that of the south polar aurora. The integrated H2 emission rate in the 900-1100 A band is a factor of two lower than that measured by the Voyager UVS. Based on model calculations, photoelectron excitation does not appear able to account for the amount of observed electron-excited H2 emission.

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