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| Titel |
Testing Lunar Permanently Shadowed Regions for Water Ice: LEND Results from LRO |
| VerfasserIn |
A. Sanin, I. Mitrofanov, M. Litvak, W. Boynton, L. Evans, K. Harshman, A. Malakhov, R. Starr |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065844
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| Zusammenfassung |
| We use data gathered by the Lunar Exploration Neutron Detector (LEND) collimated sensors
during more than one year of the mapping phase of NASA’s Lunar Reconnaissance Orbiter
(LRO) mission to make estimates of the epithermal neutron flux within known large
Permanently Shadowed Regions (PSRs) and compare it with the local neutron background
measured outside PSR areas in sunlit regions. Individual and collective analyses of PSR
properties have been performed. Only three large PSRs so far, Shoemaker and Cabeus in the
south and Rozhdestvensky U in the north, have been found to manifest significant
neutron suppression. All other PSRs have much smaller suppression, only a few
%, if at all. Some even display a positive deviation, excess of neutron emission
in respect to sunlit vicinity around them. Testing PSRs collectively, we have not
found any average suppression for them. Only the group of 18 large PSRs, with
area > 200 km2, show a marginal effect of small average suppression ~2%, with
low statistical confidence. This means that all PSRs, except PSRs in Shoemaker,
Cabeus and Rozhdestvensky U craters, are not contains any significant amount
of Hydrogen in comparison with sunlit areas around them at same latitude. Also
general smooth poleward increasing of Hydrogen abundance at sunlit areas exists. |
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