Volcanic activity at Tvashtar Catena, Io

Moses P. Milazzo, Laszlo P. Keszthelyi, Jani Radebaugh, Ashley G. Davies, Elizabeth P. Turtle, Paul Geissler, Kenneth P. Klaasen, Julie A. Rathbun, Alfred S. McEwen

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Galileo's Solid State Imager (SSI) observed Tvashtar Catena four times between November 1999 and October 2001, providing a unique look at a distinctive high latitude volcanic complex on Io. The first observation (orbit I25, November 1999) resolved, for the first time, an active extraterrestrial fissure eruption; the brightness temperature was at least 1300 K. The second observation (orbit I27, February 2000) showed a large (∼ 500 km 2) region with many, small, hot, regions of active lava. The third observation was taken in conjunction with Cassini imaging in December 2000 and showed a Pele-like, annular plume deposit. The Cassini images revealed an ∼400 km high Pele-type plume above Tvashtar Catena. The final Galileo SSI observation of Tvashtar (orbit I32, October 2001), revealed that obvious (to SSI) activity had ceased, although data from Galileo's Near Infrared Mapping Spectrometer (NIMS) indicated that there was still significant thermal emission from the Tvashtar region. In this paper, we primarily analyze the style of eruption during orbit I27 (February 2000). Comparison with a lava flow cooling model indicates that the behavior of the Tvashtar eruption during I27 does not match that of simple advancing lava flows. Instead, it may be an active lava lake or a complex set of lava flows with episodic, overlapping eruptions. The highest reliable color temperature is ∼1300 K. Although higher temperatures cannot be ruled out, they do not need to be invoked to fit the observed data. The total power output from the active lavas in February 2000 was at least 1011 W.

Original languageEnglish (US)
Pages (from-to)235-251
Number of pages17
JournalIcarus
Volume179
Issue number1
DOIs
StatePublished - Dec 1 2005

Fingerprint

catena
Io
lava
volcanology
volcanic eruption
volcanic eruptions
lava flow
orbits
solid state
plume
plumes
fissure
brightness temperature
thermal emission
near infrared
spectrometer
lakes
polar regions
cooling
deposits

Keywords

  • Image processing
  • Io
  • Satellites
  • Surfaces
  • Volcanism

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Milazzo, M. P., Keszthelyi, L. P., Radebaugh, J., Davies, A. G., Turtle, E. P., Geissler, P., ... McEwen, A. S. (2005). Volcanic activity at Tvashtar Catena, Io. Icarus, 179(1), 235-251. https://doi.org/10.1016/j.icarus.2005.05.013

Volcanic activity at Tvashtar Catena, Io. / Milazzo, Moses P.; Keszthelyi, Laszlo P.; Radebaugh, Jani; Davies, Ashley G.; Turtle, Elizabeth P.; Geissler, Paul; Klaasen, Kenneth P.; Rathbun, Julie A.; McEwen, Alfred S.

In: Icarus, Vol. 179, No. 1, 01.12.2005, p. 235-251.

Research output: Contribution to journalArticle

Milazzo, MP, Keszthelyi, LP, Radebaugh, J, Davies, AG, Turtle, EP, Geissler, P, Klaasen, KP, Rathbun, JA & McEwen, AS 2005, 'Volcanic activity at Tvashtar Catena, Io', Icarus, vol. 179, no. 1, pp. 235-251. https://doi.org/10.1016/j.icarus.2005.05.013
Milazzo MP, Keszthelyi LP, Radebaugh J, Davies AG, Turtle EP, Geissler P et al. Volcanic activity at Tvashtar Catena, Io. Icarus. 2005 Dec 1;179(1):235-251. https://doi.org/10.1016/j.icarus.2005.05.013
Milazzo, Moses P. ; Keszthelyi, Laszlo P. ; Radebaugh, Jani ; Davies, Ashley G. ; Turtle, Elizabeth P. ; Geissler, Paul ; Klaasen, Kenneth P. ; Rathbun, Julie A. ; McEwen, Alfred S. / Volcanic activity at Tvashtar Catena, Io. In: Icarus. 2005 ; Vol. 179, No. 1. pp. 235-251.
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