Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360l..55m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. L55-L58.
Astronomy and Astrophysics
Astrophysics
69
Emission Spectra, Hydrogen Ions, Infrared Spectra, Infrared Telescopes, Jupiter Atmosphere, Molecular Ions, Rotational Spectra
Scientific paper
Infrared spectra of the Jovian atmosphere around 2.1 and 4.0 microns, measured using the NASA Infrared Telescope Facility at Mauna Kea, Hawaii, are presented. The observations were made between February 6 and 8, 1990. In both spectral regions, features attributable to H3(+) were visible. The intensity ratio of lines in the 2 and 4 microns regions measured from the northern auroral 'hot spot' during the same night leads to a rovibrational temperature of 1100 + or - 100 K for this molecular ion, close to a previous measurement of the rotational temperature of 1099 + or - 100 K. This indicates that the upper energy levels are being populated by purely thermal processes, rather than by resonant energy exchange. The para-H3(+) fractional abundance of 0.58 determined by previous workers is found to be consistent with this study. The time dependency of the H3(+) emission phenomena is confirmed.
Joseph Robert D.
Miller Steven
Tennyson Jonathan
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