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    Particle Acceleration at the Pileup Collision of the Twin Shock

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    Wang_2019_ApJ_885_66(1).pdf
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    Author
    Wang, Xin
    Giacalone, Joe
    Yan, Yihua
    Ding, Mingde cc
    Li, Chuan
    Lu, Hong
    Shan, Hao
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-10-31
    Keywords
    acceleration of particles
    shock waves
    solar wind
    Sun: coronal mass ejections (CMEs)
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Xin Wang et al 2019 ApJ 885 66
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    Copyright © 2019. 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
    Ground-level enhancement (GLE) events are often associated with large gradual solar events such as fast coronal mass ejections (CMEs), but not all fast CMEs lead to GLE events. Is there a type of coordinated CME that could produce GLEs with larger intensity and higher energies than those in the normal fast isolated CMEs? Here we propose a twin-shock scenario driven by the twin CME coordinately, in which the posterior shock catches up with the preceding shock and has a pileup collision. In the present study, we chose the first GLE event of the solar cycle 24 occurring on 2012 May 17 as an example to investigate the probable association with the twin-shock scenario. We use a dynamic Monte Carlo method to examine the energy spectrum with relevance to the GLE event. In the twin-shock scenario, the seed energetic particles produced by the normal preceding shock can be injected into the posterior shock for reacceleration efficiently. As a result, we obtain the detailed energy spectrum of the solar energetic particles (SEPs) with different behaviors at the related episodes of the twin-shock evolution. Therefore, we predict that the pileup collision of the twin shock would dominate a concave energy spectral slope in the 2012 May 17 SEP event.
    ISSN
    0004-637X
    DOI
    10.3847/1538-4357/ab4655
    Version
    Final published version
    Sponsors
    Xinjiang Natural Science Foundation [2019D01A100]; Xinjiang Heaven Lake Hundred-Talent Program; NSFC, National Natural Science Foundation of China [11673056]; CAS Key Laboratory of Solar Activity, National Astronomical Observatories; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education; China Scholarship Council (CSC), China Scholarship Council; Supercomputer Center of University of Arizona
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab4655
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