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Fig. 5

image

Heat flux patterns for fracture A4 at a heliocentric distance of 2.0 AU and a plane angle η = 30° for one diurnal period of 12.4 h. The vertical lines at 0 h and 6.2 h indicate local morning and evening terminator. The coarse dotted grey line denotes the incident total solar irradiation, while the smaller black dotted line outlines the absorbed heat flux by the fracture floor. The grey continuous line shows the self-heating by infrared radiation, emitted from the fracture side walls, which impinges on the fracture floor: a positive value indicates a net heat flux direction towards the fracture floor. The grey dashed line illustrates the heat exchange with underlying nucleus layers through conductive and radiative transport. The black dashed line marks the local heat sink by sublimation phase change processes. For comparison, the dash-dotted line marks the sublimation pattern of a flat surface with identical thermophysical properties. The sublimation front is located directly at the surface of the fracture floor. Remarks: (1) the heat fluxes are related to 1 m2 sublimating fracture floor. Owing to the concave structure of geometry A4 and the decreasing width with depth, the fracture top sums up to 4 m2; (2) the fractured terrain absorbs about 4% more thermal energy than a flat surface because scattered irradiation is absorbed.

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