Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.3512w&link_type=abstract
American Astronomical Society, DPS Meeting #32, #35.12; Bulletin of the American Astronomical Society, Vol. 32, p.1059
Astronomy and Astrophysics
Astronomy
1
Scientific paper
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. \leavevmode \epsfxsize=0.8\hsize \epsfbox{464.eps}
Oliversen Ronald James
Roesler Fred L.
Scherb Frank
Woodward R. C.
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