DPS Pasadena Meeting 2000, 23-27 October 2000
Session 35. Galilean Satellites - Atmospheres and Tori Posters
Displayed, 1:00pm, Monday - 1:00pm, Friday, Highlighted Tuesday and Thursday, 3:30-6:30pm, C101-C105, C211

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[35.12] Synoptic Imaging of the Io Plasma Torus in [S II] 6731Å: Long-term Variability

R. C. Woodward (U. Wisc.), R. J. Oliversen (NASA/GSFC), F. Scherb, F. L. Roesler (U. Wisc.)

In 1997 we initiated a synoptic imaging program targeting the Io plasma torus at [S II] 6731Å, using a custom-built imager on the McMath-Pierce west auxiliary telescope on Kitt Peak. This instrument, and data from the 1997 observing season (260 images during 20 nights spanning 40 days) were presented earlier [Woodward et al. 1999]; here we add data from the 1999 season (206 images during 11 nights spanning 32 days) and present preliminary results of our analysis of long-term variability in torus brightness and morphology. In particular, we simultaneously examine changes in: the brightnesses of the ribbon and cold torus (to search for System III and System IV variability); the scale height of the ribbon (to estimate ion temperature variations); and the positions of the ansae (to search for System III and convection electric field variability---example shown below). This work was supported by NASA grants NAG5-6787 and NAS5-30131.

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