EXCITATION TEMPERATURES DETERMINED FROM $H^{+}_{3}$ HOT BAND EMISSION IN THE JOVIAN IONOSPHERE
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Date
1996
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Ohio State University
Abstract
Since our observation of the 3.544 $\mu$m $2v^{0}_{2}\rightarrow v_{2}$($J = 9 K=9\rightarrow J=8, G=9, U=1$) hot band transition of $H^{+}_{3}$ in the polar regions of $Jupitar,^{a}$ we have pursued the simultaneous detection of additional hot band transitions with fundamental band transitions in order to derive well determined $H^{+}_{3}$ excitation temperatures. We report 9 additional resolved $2v^{2}_{2}\rightarrow v_{2}$ and $v_{1} + v_{2}\rightarrow v_{1}$ hot band transitions observed in emission at 3.52, 3.63, 3.66, and 3.84 $\mu$m. The hot band transitions have thus far only been detected in the polar regions, with the occasional exception being the 3.544 $\mu$m $2v_{0}^{2}\rightarrow v_{2}$ transition around $45^{\prime}$ S latitude during the 1994 Comet Shoemaker Levy-9 encounter. Temporal and spatial variation of the excitation temperatures as well as their dependence on vibrational mode will be presented. Anomalous line intensities, e.g. $^{r}R(3,3)^{-b}$, will also be discussed. All observations were made with the CGS4 spectrometer at the United Kingdom Infrared Telescope on Mauna Kea, Hawaii.
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$^{a}$T. R. Geballe, M.-F. Jagod, and T. Oka, Astrophys, J. 408, L109-L112 (1993).$^{b}$J.-P. Maillard, P. Drossart, J. K. G. Watson, S. J. Kim, J. Caldwell, Astrophys. J. 363, L37-L41 (1990).
Author Institution: Department of Chemistry, Department of Astronomy and Astrophysics, and the Enrico Fermi Institute, The University of Chicago; Department of Chemistry, Department of Astronomy and Astrophysics, and the Enrico Fermi Institute, Joint Astronomy Centre
Author Institution: Department of Chemistry, Department of Astronomy and Astrophysics, and the Enrico Fermi Institute, The University of Chicago; Department of Chemistry, Department of Astronomy and Astrophysics, and the Enrico Fermi Institute, Joint Astronomy Centre