Two new, rare, high-effusion outburst eruptions at Rarog and Heno Paterae on Io

de Pater, Imke and Davies, Ashley Gerard and Adamkovics, Mate and Ciardi, David R. (2014) Two new, rare, high-effusion outburst eruptions at Rarog and Heno Paterae on Io. Icarus, 242. pp. 365-378. ISSN 0019-1035

Abstract

Observations obtained with the near-infrared camera NIRC2, coupled to the adaptive optics system on the 10-m W.M. Keck II telescope on Mauna Kea, Hawaii, on 15 August 2013 at ~15:30UT revealed two large 'Outburst'-class volcanic eruptions on Io. Follow-up observations five days later showed that both eruptions had substantially faded. The most energetic eruption was at Rarog Patera, at a location near 305°W, 42°S; a smaller one occurred further south at ~310°W and ~57°S, close to Heno Patera. Total radiant fluxes at Rarog Patera on August 15 were of order ~500GW/sr/μm at wavelengths between 2 and 4μm, and close to 250GW/sr/μm at 1.6μm, indicative of an effective temperature of ~1040K over an area of ~120km2, and a total thermal emission of nearly 8TW. At Heno Patera the 4-μm flux measured ~250GW/sr/μm, and ~90GW/sr/μm at 2.2μm, suggestive of an effective temperature of ~720K over an area of more than 300km2, and a total thermal emission of ~5-6TW. Fits of the Davies (Davies, A.G. [1996]. Icarus 124(1), 45-61) Io Flow Model indicate that these two eruptions are vigorous and the exposed surfaces are mostly very young, no older than 4-5min at Rarog Patera and a few hours at Heno Patera. The model fits suggest that in both locations lava fountaining is taking place, a highly-energetic style of volcanism. Using follow-up observations taken between August 20 and September 7 we estimate peak effusion rates between 5×104 and 105m3/s.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 15 Jun 2017 01:31
Last Modified: 18 Dec 2017 06:31
Uncontrolled Keywords: Infrared observations; Io; Volcanism;
Fields of Research : 04 Earth Sciences > 0403 Geology > 040302 Extraterrestrial Geology
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020199 Astronomical and Space Sciences not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1016/j.icarus.2014.06.016
URI: http://eprints.usq.edu.au/id/eprint/32199

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