Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p23a0248k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P23A-0248
Physics
5400 Planetology: Solid Surface Planets, 6200 Planetology: Solar System Objects (New Field)
Scientific paper
Delay Doppler images of Mercury's polar regions show strong evidence for ice in the polar craters (Harmon and Slade, 1992; Harmon et al., 2001) More recent high resolution S-band (12.6 cm) and X-band (3.5 cm radar images show that the ice deposits at the north pole are buried under an average of 36 cm of regolith (Slade et al., 2004; Harcke et al., in preparation). We have modified the model of Crider and Vondrak (2003) initially developed to study lunar ice traps, to calculate the thickness of regolith cover as a function of time. This model treats burial and removal of material from impacts of meteoroids with mass greater than 1 mg. In addition we treat ice deposition and loss by sublimation, sputtering and photon-stimulated desorption by interstellar radiation. We assume realistic values for an ice layer that would be deposited by a comet impact, and we assume continual bombardment by micrometeoritic and cometary dust. We discuss the probable timing of comet impacts at both the north and south poles of Mercury.
Crider Dana
Killen Rosemary Margaret
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