NOTE: Detection of Rapidly Varying H2 Emissions in Jupiter's Aurora from the Galileo Orbiter

Details NOTE: Detection of Rapidly Varying H2 Emissions in Jupiter's Aurora from the Galileo Orbiter NOTE: Detection of Rapidly Varying H2 Emissions in Jupiter's Aurora from the Galileo Orbiter

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icar..151..314p&link_type=abstract

Icarus, Volume 151, Issue 2, pp. 314-317 (2001).

Physics

7

Scientific paper

H2 band emissions in Jupiter's northern auroral region at 1240 Å were highly variable on time scales of a few seconds in Galileo ultraviolet spectrometer (UVS) recorded data from November 5, 1996 (7:25:29 to 7:34:30 spacecraft event time (SCET)) during orbit Callisto-3 (C3). Emission at 1611 Å varied in phase with 1240 Å emission, but was much weaker. The 1240 and 1611 Å variability are evidence that the precipitating particles have a highly variable flux. The estimated 1611 Å/1240 Å photon flux ratio of 1.82+/-0.07 (after background subtraction) is consistent with auroral penetration of a slant column depth in CH4 of (3.5+/-0.2)×1016 cm-2. UVS observed both the main auroral arc and the polar cap region on the day side. The slit-averaged brightness at 1240 and 1611 Å increased by almost a factor of 2 on two occasions with durations (full-width at half-maximum) of order 100 s. A similar observation of the south polar aurora near the dawn terminator during Galileo orbit Ganymede-8 on May 6, 1997 (13:16:32 to 13:32:42 SCET) found both the 1240 and 1611 Å emissions to be more steady and gradually increasing. The variable 1240 and 1611 Å emissions seen on orbit C3 may be similar to variable polar cap ``flares'' reported in recent Hubble Space Telescope (HST) ultraviolet images of Jupiter from the new Space Telescope imaging spectrograph.

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