LINE-RESOLVED SPECTROSCOPY OF THE JOVIAN H-3(+) AURORAL EMISSION AT 3.5 MICROMETERS

High-resolution line-resolved spectra of the auroral regions of Jupiter at 3.5 mum have been obtained in 1992 March at the Canada-France-Hawaii Telescope. From the width of H-3+ lines, a translational temperature of 1150 K +/- 60 K is measured, quite comparable to the rotational temperature of 1250 K +/- 70 K measured from the relative intensities of the same lines. These measurements confirm that the rotational temperatures previously measured on Jupiter from 2 and 4 mum rovibrational bands of H-3+ are consistent with a high kinetic temperature of the ionosphere. These temperatures agree with the current models of ionospheric heating by energetic particle precipitation.