Jupiter's dayglow H LY alpha emission line profile

Details Jupiter's dayglow H LY alpha emission line profile Jupiter's dayglow H LY alpha emission line profile

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1935c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 1935-1938.

Physics

22

Dayglow, Jupiter (Planet), Line Spectra, Lyman Alpha Radiation, Planetary Radiation, Equatorial Regions, Iue, Planetary Limb, Resonance Scattering, Spectrum Analysis

Scientific paper

IUE spectra of Jupiter's low-latitude H Ly-alpha emission line profile have been obtained on and off the 'Ly-alpha bulge' at the longitude of the central meridian (CML), near the limb of the planet, and at midlatitudes on the CML. All equatorial locations show line broadening beyond the IUE resolution of 0.14 A. The equatorial lines are significantly broader than at midlatitudes on the CML, and near the limb the lines are broader than on the CML, both on and off the bulge. The observed line shapes are not consistent with pure resonant scattering of solar Ly-alpha by upper atmospheric H atoms with a variable H abundance: calculated profiles near the limb have much less intense cores. The broadening of the bulge line profiles on the CML and limb compared with off-bulge regions demonstrates that the bulge effect is a broadening of the line, not an increase in the line core flux. It is proposed that there is either a substantial broadened internal source and/or the upper atmosphere has considerable Doppler broadening (winds or turbulence) to increase the resonant scattering line width.

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