High heat flow from Enceladus' south polar region measured using 10-600 cm-1 Cassini/CIRS data

被引：146

作者：

Howett, C. J. A. ^{[1
]}

Spencer, J. R. ^{[1
]}

Pearl, J. ^{[2
]}

Segura, M. ^{[2
]}

机构：

[1] SW Res Inst, Boulder, CO 80302 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | 2011年 / 116卷

关键词：

BOLOMETRIC ALBEDOS; ENERGY-BALANCE; LIQUID WATER; E-RING; SURFACE; ORIGIN; SATURN; IO; FRACTURES; MODELS;

D O I：

10.1029/2010JE003718

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Analysis of 2008 Cassini Composite Infrared Spectrometer (CIRS) 10 to 600 cm(-1) thermal emission spectra of Encleadus shows that for reasonable assumptions about the spatial distribution of the emission and the thermophysical properties of the solar-heated background surface, which are supported by CIRS observations of background temperatures at the edge of the active region, the endogenic power of Enceladus' south polar terrain is 15.8 +/- 3.1 GW. This is significantly higher than the previous estimate of 5.8 +/- 1.9 GW. The new value represents an improvement over the previous one, which was derived from higher wave number data (600 to 1100 cm(-1)) and was thus only sensitive to high-temperature emission. The mechanism capable of producing such a high endogenic power remains a mystery and challenges the current models of proposed heat production.

引用

页数：15