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    Using mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientations

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    Cameron_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf (519.0Kb)
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    https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA026080
    Permanent Link
    https://doi.org/10.1029/2018JA026080
    http://hdl.handle.net/11603/12857
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    • UMBC Faculty Collection
    • UMBC Goddard Planetary Heliophysics Institute (GPHI)
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    Author/Creator
    Cameron, T. G.
    Jackel, B. J.
    Oliveira, D. M.
    Date
    2019-02-04
    Type of Work
    33 pages
    Text
    journal articles postprints
    Citation of Original Publication
    T. G. Cameron, B. J. Jackel, D. M. Oliveira, Using mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientations, Journal of Geophysical Research: Space Physics, 2019, https://doi.org/10.1029/2018JA026080
    Rights
    This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
    © 2018. American Geophysical Union. All Rights Reserved.
    Subjects
    solar wind magnetosphere coupling
    solar wind structures
    information theory
    Abstract
    The geoeffectiveness of solar wind shocks depends on angle with respect to the Sun‐Earth line, with highly angled solar wind shocks being less geoeffective than nearly frontal solar wind shocks. However, it is unclear whether this holds for the orientation of structures in non‐shocked solar wind. In this paper, we perform a mutual information analysis of 18 years of in‐situ solar wind and ground magnetometer data in order to investigate the effects of solar wind phase front orientation on solar wind geoeffectiveness (indicated by SuperMAG SME). Since geomagnetic response is strongly influenced by Interplanetary Magnetic Field (IMF) Bz, and IMF Bz affects phase front orientation, we use conditional mutual information to account for the effect of Bz on geomagnetic activity. In contrast to what has been found for solar wind shocks, we find that during times of IMF Bz >0, phase fronts aligned with the average Parker spiral direction (45 deg azimuth, 0 deg inclination) tend to be associated with higher geomagnetic activity (SME >500 nT) than would be expected if IMF Bz and phase front orientation quantities were unrelated. During times of IMF Bz <0, there is no connection between solar wind phase front orientation and geomagnetic activity (SME). We believe that Parker spiral aligned phase fronts being associated with higher geomagnetic activity during times of IMF Bz > 0 is due to constant phase front orientation allowing for more efficient energy transfer either through viscous interaction or high latitude reconnection.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3544


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.