Saturn Auroras Seen In Visible And Near-IR By Cassini ISS

Details Saturn Auroras Seen In Visible And Near-IR By Cassini ISS Saturn Auroras Seen In Visible And Near-IR By Cassini ISS

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1204w&link_type=abstract

American Astronomical Society, DPS meeting #42, #12.04; Bulletin of the American Astronomical Society, Vol. 42, p.1024

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Scientific paper

New data from the Cassini ISS narrow-angle camera allows us to make measurements of Saturn's night-side auroras in both the northern and southern hemispheres. The aurora was detected in hydrogen alpha (652-661 nm), red (574-724 nm), and broad-band infrared (668-833 nm) wavelengths, and also faintly in blue (405-505 nm) and green (507-632 nm) wavelengths. The brightness in each filter appears to agree with predicted spectra for Saturnian auroras (Aguilar, 2008). Along with the spectra and brightness measurements, we will present two 400+ frame movies taken in the clear filter, one showing aurora in the northern hemisphere from October 5-9, 2009, with a timestep of approximately three minutes, and the other showing the aurora in the southern hemisphere, from June 26, 2010, with a timestep of approximately one minute. These movies show the aurora varying dramatically with both time and longitude. Near the limb the height of the aurora above its base can be measured; this height can reach more than 1200 km. The main auroral oval in the southern hemisphere appears near -72° latitude, with smaller instances of auroral activity near -75° and -77°.
Aguilar, A., J. M. Ajello, R. S. Mangina, G. K. James, H. Abgrall, and E. Roueff, "The electron-excited middle UV to near IR spectrum of H2 : Cross-sections and transition probabilities", Astrophys. J. Supp. Ser., 177 (2008).

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