HR: 0800h
AN: P31A-0971 [Abstracts]
TI: Mapping the Velocity Distribution of Neutral Sodium Near Io
AU: * Corliss, J B
EM: corliss@wisp.physics.wisc.edu
AF: University of Wisconsin, Madison, Dept. of Physics 1150 University Ave, Madison, WI 53706
United States
AU: Potter, A E
EM: apotter@noao.edu
AF: National Solar Observatory, 950 N. Cherry Avenue, Tucson, AZ 85726-6732
United States
AU: Scherb, F
EM: scherb@wisp.physics.wisc.edu
AF: University of Wisconsin, Madison, Dept. of Physics 1150 University Ave, Madison, WI 53706
United States
AU: Roesler, F
EM: roesler@wisp.physics.wisc.edu
AF: University of Wisconsin, Madison, Dept. of Physics 1150 University Ave, Madison, WI 53706
United States
AU: Harris, W
EM: wmharris@u.washington.edu
AF: University of Washington, Dept. of Earth and Space Sciences 360 Johnson Hall, Seattle, WA 90195
United States
AU: Killen, R M
EM: rkillen@astro.umd.edu
AF: University of Maryland, Department of Astronomy, College Park, MD 20742
United States
AB:
We report on two dimensional velocity maps of neutral sodium near Io obtained on 20 November, 1999, using the National Solar
Observatory McMath-Pierce stellar spectrograph. The stellar spectrograph was utilized in high spectral resolution (R =
150,000) mode with a 10x10 element image slicer array with arc second spatial resolution. The sodium emission was uncommonly
bright on this night, which, combined with excellent seeing conditions, allowed a rare opportunity for us to generate images
of the distinctly different velocity populations of sodium for that night. We observed the changes in these populations over
a period of about three hours following emergence of Io from eclipse by Jupiter. We will present line profiles and imaging
from this night that show several distinct velocity resolved populations at different locations near Io, and discuss the
mechanisms that may give rise to them. These observations were part of our continuing observations of the increases observed
in sodium emissions following emergence of Io from eclipse, and we will summarize the current status of these observations.
This work was supported by the NASA Planetary Astronomy Program and the National Solar Observatory, Tucson, Arizona.
DE: 6218 Jovian satellites
DE: 2720 Energetic particles, trapped
DE: 2756 Planetary magnetospheres (5443, 5737, 6030)
DE: 0343 Planetary atmospheres (5405, 5407, 5409, 5704, 5705, 5707)
SC: Planetary Sciences [P]
MN: 2004 AGU Fall Meeting