Physics – Optics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1812m&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1812
Physics
Optics
Scientific paper
Io was observed in December 2001 with the NIRC2 camera, mounted on the Keck II Adaptive Optics (AO) system. Fourteen Observations were performed on ten days in three broadband infrared filters K (2.2 μm), L' (3.8 μm) and Ms (4.7 μm). The angular resolution achieved is 0.05" in K-band, i.e. 120-140 km on Io. Images were processed using MISTRAL to enhance their sharpness. The 14 images provide a complete survey of Io's surface during one full rotation. 26 hot spots were detected in Lp-band and roughly twice as many in Ms-band. Two active centers (Pele and Malik) were clearly seen in K-band indicating a higher temperature of lava. The L/M temperature (from 300 to 1200 K) and the surface area (from 5 to 90000 km^2) on each hot spot give indications about the nature of the volcanic area (fire fountain, lava lake or lava flow field). Comparison with previous Galileo/NIMS data of the most important active centers (Loki, Pele, Amirani, Surt...) will be shown. We will conclude describing how the future use of AO technique will help to monitor and understand this extraterrestrial and exotic volcanism.
Chaffee Frederic
de Pater Imke
Fusco Th.
Keck Science Team
Le Mignant David
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