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    Relative Timing of Nightside and Dayside Plasmapause Motion: Two Events in June 2001

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    Author
    Goldstein, J. cc
    Sandel, B. R. cc
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-12-22
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Goldstein, J., & Sandel, B. R. (2020). Relative timing of nightside and dayside plasmapause motion: Two events in June 2001. Journal of Geophysical Research: Space Physics, 125(1), e2019JA027153.
    Journal
    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
    Rights
    © 2019. American Geophysical Union. All Rights Reserved.
    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
    We examine the relative timing of dayside and nightside plasmapause motion following southward interplanetary magnetic field turnings on 2 and 9 June 2001. For both events the delay between the dayside and nightside plasmapause response is less than the temporal resolution of Imager for Magnetopause-to-Aurora Global Exploration extreme ultraviolet observations (10 min). Our result thus establishes a possible upper limit (<= 10 min) on the day-to-night onset delay. From analysis of the extreme ultraviolet-observed plasmapause motion we find on 2 June the time-averaged plasmapause E field was (in mV/m) 0.61 near noon magnetic local time, 0.35 near midnight magnetic local time, and 0.44 overall. The normalized plasmapause speed data (both dayside and nightside) are fitted to the curve (0.09 +/- 0.05)L-3, consistent with a spatially uniform and time-constant dawn-dusk penetration E field that is 9% of the solar wind field. On 9 June the time-averaged E field values (mV/m) were 0.24 (dayside), 0.28 (nightside), and 0.26 (overall); the plasmapause motion was consistent with a penetration E field 10% of the solar wind field. Plasmasphere erosion is a fundamental element of the dynamic magnetospheric response to solar wind driving. This study yields an important observational constraint on the day-to-night timing of the plasmapause response. The result also has implications for the two main models for the cause of erosion (convection and interchange).
    Note
    6 month embargo; first published online 22 December 2019
    ISSN
    2169-9380
    EISSN
    2169-9402
    DOI
    10.1029/2019ja027153
    Version
    Final published version
    Sponsors
    National Aeronautics and Space Administration
    ae974a485f413a2113503eed53cd6c53
    10.1029/2019ja027153
    Scopus Count
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    UA Faculty Publications

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