Io

Heat flow from small volcanic features

Glenn J. Veeder, Ashley Gerard Davies, Dennis L. Matson, Torrence V. Johnson, David Williams, Jani Radebaugh

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We identify nine new faint thermal sources on Io via color ratio images constructed from relatively high spatial resolution Galileo NIMS data acquired late in the mission. All of these identifications are associated with small dark paterae. We utilize NIMS data to quantify their volcanic thermal emission as ~0.53×1012W (or ~0.5% of Io's total heat flow). In addition, we refine our previous estimates of the thermal emission from 47 hot spots and highlight several hot spots within the Amirani flow field.Small dark paterae still out-number faint (close to the limit of detection) hot spots identified in high spatial resolution multi-wavelength NIMS data. In particular, we point out 24 small dark paterae that were scanned by NIMS (at resolutions down to ~17. km/pixel) but had no detectable volcanic thermal emission. All dark paterae are expected to have some volcanic thermal emission, but the small size and finite number of detectable faint sources limit their contribution to the total heat flow on Io. Compared to small paterae, small dark flows are more numerous but must have significantly lower surface temperatures.Finally, we update and summarize our results for the global heat flow on Io due to 242 recently active volcanic features including other dark paterae as well as large dark flows. The volcanic thermal emission from known hot spots, undetected (scanned) dark patera and outbursts can account for only ~56.2×1012W (or ~54%) of Io's total heat flow. Approximately 49×1012W (or ~46%) of Io's heat flow remains an enigma.

Original languageEnglish (US)
Pages (from-to)379-410
Number of pages32
JournalIcarus
Volume245
DOIs
StatePublished - Jan 1 2015

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volcanic feature
Io
thermal emission
heat transmission
heat flow
volcanology
hot spot
spatial resolution
high resolution
surface temperature
flow distribution
pixels
color
outburst
flow field
estimates
pixel
wavelengths
wavelength

Keywords

  • Geophysics
  • Io
  • Jupiter, satellites
  • Volcanism

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Veeder, G. J., Davies, A. G., Matson, D. L., Johnson, T. V., Williams, D., & Radebaugh, J. (2015). Io: Heat flow from small volcanic features. Icarus, 245, 379-410. https://doi.org/10.1016/j.icarus.2014.07.028

Io : Heat flow from small volcanic features. / Veeder, Glenn J.; Davies, Ashley Gerard; Matson, Dennis L.; Johnson, Torrence V.; Williams, David; Radebaugh, Jani.

In: Icarus, Vol. 245, 01.01.2015, p. 379-410.

Research output: Contribution to journalArticle

Veeder, GJ, Davies, AG, Matson, DL, Johnson, TV, Williams, D & Radebaugh, J 2015, 'Io: Heat flow from small volcanic features', Icarus, vol. 245, pp. 379-410. https://doi.org/10.1016/j.icarus.2014.07.028
Veeder GJ, Davies AG, Matson DL, Johnson TV, Williams D, Radebaugh J. Io: Heat flow from small volcanic features. Icarus. 2015 Jan 1;245:379-410. https://doi.org/10.1016/j.icarus.2014.07.028
Veeder, Glenn J. ; Davies, Ashley Gerard ; Matson, Dennis L. ; Johnson, Torrence V. ; Williams, David ; Radebaugh, Jani. / Io : Heat flow from small volcanic features. In: Icarus. 2015 ; Vol. 245. pp. 379-410.
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