Jordan A. Evidence for dielectric breakdown weathering on the Moon.
ICARUS 2021;
358:114199. [PMID:
33867568 PMCID:
PMC8051153 DOI:
10.1016/j.icarus.2020.114199]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Soil on the Moon is darkened by space weathering, a process generally assumed to be dominated by the solar wind and/or micrometeoroid impacts. Recent work, however, predicts that another process darkens the soil: large solar energetic particle events may cause dielectric breakdown (or "sparking"), melting and vaporizing soil at a rate comparable to that of micrometeoroids. Unlike the solar wind and/or micrometeoroids, a combination of dielectric breakdown and micrometeoroid weathering can explain how the reflectance of the lunar maria varies with latitude at 750 and 1064 nm, and this combination provides a reasonable mechanism to explain how magnetic anomalies form prominent swirls in the maria. Consequently, space weathering in the lunar maria seems to be dominated by micrometeoroid impacts and dielectric breakdown.
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