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    Evidence for negative charging of the lunar surface in shadow

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    Name:
    Halekas_et_al-2002-Geophysical ...
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    Description:
    FInal Published Version
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    Author
    Halekas, J. S.
    Mitchell, D. L.
    Lin, R. P.
    Hood, L. L.
    Acuña, M. H.
    Binder, A. B.
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2002-05-15
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Evidence for negative charging of the lunar surface in shadow 2002, 29 (10):77-1 Geophysical Research Letters
    Journal
    Geophysical Research Letters
    Rights
    © 2002 by the Chinese Geophysical Society.
    Collection Information
    This 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.
    Abstract
    Observations 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.
    Note
    6 month embargo; First published: 15 May 2002
    ISSN
    00948276
    DOI
    10.1029/2001GL014428
    Version
    Final published version
    Sponsors
    Research at the University of California, Berkeley, was supported by NASA through subcontract LRI-99-101 from the Lunar Research Institute.
    Additional Links
    http://doi.wiley.com/10.1029/2001GL014428
    ae974a485f413a2113503eed53cd6c53
    10.1029/2001GL014428
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