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Cassini UVIS Observations of the Io Plasma Torus: I. Initial Results | | Andrew J. Steffl
; A. Ian F. Stewart
; Fran Bagenal
; | | Date: |
16 Jan 2013 | | Abstract: | During the Cassini spacecraft’s flyby of Jupiter (October, 2000-March, 2001),
the Ultraviolet Imaging Spectrograph (UVIS) produced an extensive dataset
consisting of 3,349 spectrally dispersed images of the Io plasma torus. Here we
present an example of the raw data and representative EUV spectra
(561{AA}-1181{AA}) of the torus, obtained on October 1, 2000 and November 14,
2000. For most of the flyby period, the entire Io torus fit within the UVIS
field-of-view, enabling the measurement of the total power radiated from the
torus in the extreme ultraviolet. A typical value for the total power radiated
in the wavelength range of 580{AA}-1181{AA} is 1.7x10^12 W, with observed
variations of up to 25%. Several brightening events were observed. These events
lasted for roughly 20 hours, during which time the emitted power increased
rapidly by ~20% before slowly returning to the pre-event level. Observed
variations in the relative intensities of torus spectral features provide
strong evidence for compositional changes in the torus plasma with time.
Spatial profiles of the EUV emission show no evidence for a sharply peaked
"ribbon" feature. The ratio of the brightness of the dusk ansa to the
brightness of the dawn ansa is observed to be highly variable, with an average
value of 1.30. Weak longitudinal variations in the brightness of the torus
ansae were observed at the 2% level. | | Source: | arXiv, 1301.3818 | | Services: | Forum | Review | PDF | Favorites | |
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