The ultraviolet spectra of the Jovian aurora

Journal Article · Thu Aug 01 00:00:00 EDT 1996 · Astrophysical Journal

DOI:https://doi.org/10.1086/177618· OSTI ID:388159

Liu, W; Dalgarno, A ^[1]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

The ultraviolet spectra of molecular hydrogen H{sub 2} due to electron impact excitation are calculated and compared with the high-resolution (0.56 A) spectra of the Jovian aurora obtained with the {ital Hubble} {ital Space} {ital Telescope} Goddard High-Resolution Spectrograph. All the observed features are reproduced by electron impact excitation emissions of H{sub 2}, and the predicted intensities agree well with the observed intensities. Accurate molecular parameters are used, and effects of secondary electrons are included. The auroral emissions are reproduced by energetic electron impact excitation of H{sub 2} with a temperature of 400{endash}600 K. Large temperature gradients occur with respect to altitude within the auroral emission regions. The auroral spectra contain a cascade contribution to the Lyman band emission from high-lying {ital E} and {ital F} states that are populated by the low-energy secondary electrons produced as the energetic auroral electrons slow down. {copyright} {ital 1996 The American Astronomical Society.}

• OSTI ID: 388159
• Journal Information: Astrophysical Journal, Vol. 467, Issue 1; Other Information: PBD: Aug 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
JUPITER PLANET
AURORAE
ULTRAVIOLET SPECTRA
HYDROGEN
ELECTRON-MOLECULE COLLISIONS
EXCITATION
HYDROGEN MOLECULES
LINE INTENSITY