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dc.contributor.authorHalekas, J. S.
dc.contributor.authorMitchell, D. L.
dc.contributor.authorLin, R. P.
dc.contributor.authorHood, L. L.
dc.contributor.authorAcuña, M. H.
dc.contributor.authorBinder, A. B.
dc.date.accessioned2017-05-05T21:20:58Z
dc.date.available2017-05-05T21:20:58Z
dc.date.issued2002-05-15
dc.identifier.citationEvidence for negative charging of the lunar surface in shadow 2002, 29 (10):77-1 Geophysical Research Lettersen
dc.identifier.issn00948276
dc.identifier.doi10.1029/2001GL014428
dc.identifier.urihttp://hdl.handle.net/10150/623417
dc.description.abstractObservations of electron distributions above the shadowed surface of the Moon show energy-dependent loss cones which indicate reflection by both magnetic and electric fields. At the same time, low energy (≲100 eV) field aligned upward-going electron beams are observed. Together, these observations imply average night-side potential differences between the surface and the Lunar Prospector (LP) spacecraft of ∼−35 V. The lunar surface may be at an even higher negative potential relative to the ambient plasma, since LP will likely also charge negative. The potential difference is consistent with simple current balance models which include secondary emission. No clear dependence is found on surface terrane type and age, or on ambient electron density and temperature. Instead, the potential difference is found to depend strongly on the angle from the subsolar point and the angle between the magnetic field and the normal to the lunar surface.
dc.description.sponsorshipResearch at the University of California, Berkeley, was supported by NASA through subcontract LRI-99-101 from the Lunar Research Institute.en
dc.language.isoenen
dc.publisherAMER GEOPHYSICAL UNIONen
dc.relation.urlhttp://doi.wiley.com/10.1029/2001GL014428en
dc.rights© 2002 by the Chinese Geophysical Society.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleEvidence for negative charging of the lunar surface in shadowen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben
dc.identifier.journalGeophysical Research Lettersen
dc.description.note6 month embargo; First published: 15 May 2002en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
dc.contributor.institutionSpace Sciences Laboratory; University of California; Berkeley USA
dc.contributor.institutionSpace Sciences Laboratory; University of California; Berkeley USA
dc.contributor.institutionSpace Sciences Laboratory; University of California; Berkeley USA
dc.contributor.institutionLunar and Planetary Laboratory; University of Arizona; Tucson USA
dc.contributor.institutionNASA Goddard Space Flight Center; Greenbelt Maryland USA
dc.contributor.institutionLunar Research Institute; Tucson Arizona USA
refterms.dateFOA2002-11-06T00:00:00Z
html.description.abstractObservations of electron distributions above the shadowed surface of the Moon show energy-dependent loss cones which indicate reflection by both magnetic and electric fields. At the same time, low energy (≲100 eV) field aligned upward-going electron beams are observed. Together, these observations imply average night-side potential differences between the surface and the Lunar Prospector (LP) spacecraft of ∼−35 V. The lunar surface may be at an even higher negative potential relative to the ambient plasma, since LP will likely also charge negative. The potential difference is consistent with simple current balance models which include secondary emission. No clear dependence is found on surface terrane type and age, or on ambient electron density and temperature. Instead, the potential difference is found to depend strongly on the angle from the subsolar point and the angle between the magnetic field and the normal to the lunar surface.


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