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Heat Flow From the South Pole of Enceladus: Spatial Distribution and Power Supply

Spencer, J R ; Pearl, J C ; Segura, M ; Abramov, O ; Team, C C

Eos (Washington, D.C.), 2006-12, Vol.87 (52)

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  • Título:
    Heat Flow From the South Pole of Enceladus: Spatial Distribution and Power Supply
  • Autor: Spencer, J R ; Pearl, J C ; Segura, M ; Abramov, O ; Team, C C
  • É parte de: Eos (Washington, D.C.), 2006-12, Vol.87 (52)
  • Notas: SourceType-Scholarly Journals-2
    ObjectType-Conference Paper-1
    content type line 23
    SourceType-Conference Papers & Proceedings-1
    ObjectType-Feature-2
    ObjectType-Article-3
  • Descrição: In July 2005 the Cassini CIRS instrument observed apparently endogenic thermal emission from the 'tiger stripe' fractures in the south polar region of Enceladus. Average temperatures of 133 K are observed over areas equivalent to an average 700 meter width along the length of the tiger stripes, radiating a total power of about 6 GW. There appear to be smaller areas at temperatures of at least 145 K, and perhaps much hotter. Closer analysis of the July 2005 CIRS data reveals that activity along the tiger stripes is not uniform- thermal emission varies greatly along their length. New details on the distribution and temperature of the thermal emission will be provided in November 2006, when Cassini obtains its best look at the south polar region of Enceladus since the 2005 discovery of activity there, and we will present initial results from these new observations. The large amount of heat being radiated from the vicinity of the tiger stripes must be supplied by conduction or convection from below, or by delivery of energy to the surface from the plume itself. We will discuss plausible mechanisms for delivering the observed heat flow, and the implications for the plume generation mechanism and the interior of Enceladus.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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