Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm32a..06b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM32A-06
Physics
[2704] Magnetospheric Physics / Auroral Phenomena
Scientific paper
We present a quantitative description of Saturn's northern infrared aurora using images acquired by Cassini VIMS during 2006-2008. The images display various morphologies, including bright arcs at all local times and prevalent polar features such as localised spots, diffuse, low-intensity emissions and intense infillings. The equatorward extent of the emissions was determined for each image and the average boundary derived using a best fit circle method. The average circle was found to have a radius of 16.9 ± 0.3° latitude, centred ~2° anti-sunward of Saturn's pole. The low standard deviation of the fitted circle radii (1°) indicates the relative stability of the equatorward auroral boundary. These fundamental results are in good agreement with values previously determined for the ultraviolet aurora, suggesting that the emissions at different wavelengths are produced by a common driver despite the distinct emission mechanisms. Comparisons with the southern aurora and SKR phase are also discussed.
Achilleos Nicholas A.
Badman Sarah V.
Baines Kevin Hays
Brown Harvey R.
Bunce Emma J.
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