Io: Heat flow from dark volcanic fields

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• 作者：Glenn J. Veeder ; Ashley Gerard Davies ; Dennis L. Matson ; Torrence V. Johnson
• 关键词：Io ; Volcanism ; Jupiter ; Satellites
• 刊名：Icarus
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：204
• 期：1
• 页码：239-253
• 全文大小：860 K

文摘

Dark flow fields on the jovian satellite Io are evidence of current or recent volcanic activity. We have examined the darkest volcanic fields and quantified their thermal emission in order to assess their contribution to Io’s total heat flow. Loki Patera, the largest single source of heat flow on Io, is a convenient point of reference. We find that dark volcanic fields are more common in the hemisphere opposite Loki Patera and this large scale concentration is manifested as a maximum in the longitudinal distribution (near 200 °W), consistent with USGS global geologic mapping results. In spite of their relatively cool temperatures, dark volcanic fields contribute almost as much to Io’s heat flow as Loki Patera itself because of their larger areal extent. As a group, dark volcanic fields provide an asymmetric component of 5 % of Io’s global heat flow or 5 × 10¹² W.