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    The Heliospheric Current Sheet and Plasma Sheet during Parker Solar Probe’s First Orbit

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    Lavraud_2020_ApJL_894_L19.pdf
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    Author
    Lavraud, B.
    Fargette, N.
    Réville, V.
    Szabo, A.
    Huang, J.
    Rouillard, A. P.
    Viall, N.
    Phan, T. D.
    Kasper, J. C.
    Bale, S. D. cc
    Berthomier, M.
    Bonnell, J. W.
    Case, A. W.
    Dudok de Wit, T.
    Eastwood, J. P.
    Génot, V.
    Goetz, K.
    Griton, L. S.
    Halekas, J. S
    Harvey, P.
    Kieokaew, R.
    Klein, K. G.
    Korreck, K. E.
    Kouloumvakos, A.
    Larson, D. E.
    Lavarra, M.
    Livi, R.
    Louarn, P.
    MacDowall, R. J.
    Maksimovic, M.
    Malaspina, D.
    Nieves-Chinchilla, T.
    Pinto, R. F.
    Poirier, N.
    Pulupa, M.
    Raouafi, N. E.
    Stevens, M. L.
    Toledo-Redondo, S.
    Whittlesey, P. L.
    Show allShow less
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2020-05-08
    Keywords
    Slow solar wind
    Solar coronal streamers
    Solar coronal transients
    Heliosphere
    Solar magnetic reconnection
    Space plasmas
    Plasma jets
    
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    Publisher
    IOP PUBLISHING LTD
    Citation
    Lavraud, B., Fargette, N., Réville, V., Szabo, A., Huang, J., Rouillard, A. P., ... & Whittlesey, P. L. (2020). The Heliospheric Current Sheet and Plasma Sheet during Parker Solar Probe’s First Orbit. The Astrophysical Journal Letters, 894(2), L19.
    Journal
    ASTROPHYSICAL JOURNAL LETTERS
    Rights
    © 2020. The American Astronomical Society. 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 present heliospheric current sheet (HCS) and plasma sheet (HPS) observations during Parker Solar Probe's (PSP) first orbit around the Sun. We focus on the eight intervals that display a true sector boundary (TSB; based on suprathermal electron pitch angle distributions) with one or several associated current sheets. The analysis shows that (1) the main density enhancements in the vicinity of the TSB and HCS are typically associated with electron strahl dropouts, implying magnetic disconnection from the Sun, (2) the density enhancements are just about twice that in the surrounding regions, suggesting mixing of plasmas from each side of the HCS, (3) the velocity changes at the main boundaries are either correlated or anticorrelated with magnetic field changes, consistent with magnetic reconnection, (4) there often exists a layer of disconnected magnetic field just outside the high-density regions, in agreement with a reconnected topology, (5) while a few cases consist of short-lived density and velocity changes, compatible with short-duration reconnection exhausts, most events are much longer and show the presence of flux ropes interleaved with higher-beta regions. These findings are consistent with the transient release of density blobs and flux ropes through sequential magnetic reconnection at the tip of the helmet streamer. The data also demonstrate that, at least during PSP's first orbit, the only structure that may be defined as the HPS is the density structure that results from magnetic reconnection, and its byproducts, likely released near the tip of the helmet streamer.
    ISSN
    2041-8205
    EISSN
    2041-8213
    DOI
    10.3847/2041-8213/ab8d2d
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/ab8d2d
    Scopus Count
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    UA Faculty Publications

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