当前位置: X-MOL 学术Space Sci. Rev. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Thermal Properties of Icy Surfaces in the Outer Solar System
Space Science Reviews ( IF 10.3 ) Pub Date : 2018-10-18 , DOI: 10.1007/s11214-018-0546-x
C. Ferrari

The thermal properties of airless icy surfaces are providing a wealth of information on their regolith structure after eons of space weathering. Numerous observations of the thermal cycles of Jupiter and Saturn icy satellites or Centaurs and TNOs have been acquired in the latest decades thanks to the Galileo and Cassini missions and to the Spitzer and Herschel telescopes. These observations and the latest developments on thermophysical modeling which have been achieved to link the thermal inertia to the regolith structure are reviewed here. Measured thermal inertias of these surfaces covered with water ice are very low, roughly between about 1 and 100 J/m2/K/s1/2. Often interpreted as due to unconsolidated or highly porous regoliths, these low values may result from a composition of amorphous ice or from the roughness of grains defacing contacts in a regolith of normal compaction. Taken together, thermal inertias appear to increase with probed depth and to decrease with heliocentric distance. This latter effect can be easily reproduced if heat transfer is dominated by radiation in pores, despite low temperatures, because the conduction through grains is limited, either due to the presence of amorphous ice or because of the roughness of grains.

中文翻译:

外太阳系冰面的热学性质

经过数亿年的太空风化后,无空气冰面的热特性提供了有关其风化层结构的大量信息。由于伽利略和卡西尼号任务以及斯皮策望远镜和赫歇尔望远镜,在最近几十年中,人们对木星和土星冰卫星或半人马和 TNO 的热循环进行了大量观测。这些观察结果以及热物理建模的最新进展将热惯性与风化层结构联系起来,在此进行回顾。这些被水冰覆盖的表面测得的热惯性非常低,大约在 1 到 100 J/m2/K/s1/2 之间。通常解释为由于松散或高度多孔的风化层,这些低值可能是由于无定形冰的成分或正常压实的风化层中的颗粒粗糙接触面造成的。总之,热惯性似乎随着探测深度的增加而增加,而随着日心距离的增加而减少。如果传热以孔隙中的辐射为主,尽管温度很低,则后一种效应可以很容易地重现,因为通过晶粒的传导是有限的,无论是由于无定形冰的存在还是因为晶粒的粗糙度。
更新日期:2018-10-18
down
wechat
bug