SWIRLS. Spectral and Thermophysical Properties of Lunar Swirls from the Diviner Lunar Radiometer Tim Glotch, Stony Brook University
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1 SWIRLS Spectral and Thermophysical Properties of Lunar Swirls from the Diviner Lunar Radiometer Tim Glotch, Stony Brook University
2 1. Space Weathering FORMATION MECHANISMS Some swirls associated with strong magnetic fields. B- fields protect the surface from charged solar wind particles. 2. Impact by swarms of micro-comets or meteors Swarms disturb regolith, revealing unweathered subsurface 3. Dust Transport Feldspathic dust lofted by electric fields generated as terminator passes over surface 4. Hybrid dust lofting + magnetic sorting + fairy castle destroying
3 8 MICRON CHANNELS Greenhagen et al., 2010
4 SPACE WEATHERING CF Map, FeO Removed OMAT Lucey et al., 2010
5 CF ANOMALY AT SWIRLS Reiner Gamma Van de Graaff Crater CF, microns CF, microns
6 CF ANOMALY AT SWIRLS
7 ARE DARK LANES DARK? Rima Sirsalis Firsov
8 CF VS OMAT
9 CF VS OMAT
10 SUMMARY SO FAR Diviner observations show CF shift at both highlands and mare swirl sites Consistent with atypical space weathering related to solar wind deflection + continued impact bombardment Implication: Solar wind sputtering and/or implantation more important than micrometeorite bombardment? Implication: Micrometeorite bombardment necessary but not sufficient for optical maturation? Dark lanes are in some cases darker than surrounding terrain, but CF s identical to surrounding terrain
11 OTHER MECHANISMS Dust lofting mechanism predicts pile of feldsparenriched fine regolith at swirl sites to explain albedo and VNIR spectral properties of swirls. Comet/meteoroid swirl mechanism would result in disturbance of upper regolith. Test using 3 Diviner-derived data products lab spectral mixing +CF, roughness, and night-time cooling model
12 OLV/PLG MIXTURES
13 Simplify lunar regolith as olv/plg mixtures DUST LOFTING For typical mare regolith, feldspar is enriched 2-4% in finest size fraction CF shift observed for mare swirls would require additional ~16 wt.% feldspar CF shift observed for highland swirls would require additional ~20 wt.% feldspar
14 ROUGHNESS Dust lofting and micro-comet/meteoroid swarm hypotheses would be expected to alter surface regolith structure at cm to mm scales. Regolith disturbance via bombardment would make surface rougher Dust lofting would make surface smoother What do Diviner daytime measurements and Hayne roughness model have to say about this?
15 ROUGHNESS 5 contours from 10 to 40 RMS roughness
16 ROUGHNESS Dust lofting and micro-comet/meteoroid swarm hypotheses would be expected to alter surface regolith structure at cm to mm scales. Regolith disturbance via bombardment would make surface rougher Dust lofting would make surface smoother What do Diviner daytime measurements and Hayne roughness model have to say about this? Both swirl and off-swirl sites have RMS roughness values between 25-30, typical of lunar regolith.
17 SWIRL THERMOPHYSICS Reiner Gamma, -3.6 to 7.0 ΔK Van de Graaff Crater, -7.0 to 15 ΔK
18 SWIRL THERMOPHYSICS Reiner Gamma swirl is, on average, only 0.5 K cooler than surrounding terrain at night time. Van de Graaff crater is 0.4 K warmer than surrounding terrain Night-time cooling model can shed light on swirl formation mechanism. Can lofted dust pile account for temperature difference at swirl sites?
19 SWIRL THERMOPHYSICS
20 SWIRL THERMOPHYSICS Reiner Gamma swirl is, on average, only 0.5 K cooler than surrounding terrain at night time. Van de Graaff crater is 0.4 K warmer than surrounding terrain Night-time cooling model can shed light on swirl formation mechanism. Adding even a 2 mm fluffy layer results in swirl temperatures that are much too cold to explain Diviner observations
21 CONCLUSIONS Diviner data and related lab measurements and models support solar wind standoff model of swirl formation. Dust lofting, micrometeoroid/comet bombardment, and hybrid models must account for Diviner CF measurements, roughness properties, and thermal model properties.
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