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    “Trunk-like” heavy ion structures observed by the Van Allen Probes

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    Zhang, J.-C.; Kistler, L.M.; Spence, H.E.; Wolf, R.A.; Reeves, G.; More... Skoug, R.; Funsten, H.; Larsen, B.A.; Niehof, J.T.; MacDonald, E.A.; Friedel, R.; Ferradas, C.P.; Luo, H. Less...
    Date
    2015
    Abstract
    Dynamic ion spectral features in the inner magnetosphere are the observational signatures of ion acceleration, transport, and loss in the global magnetosphere. We report “trunk-like” ion structures observed by the Van Allen Probes on 2 November 2012. This new type of ion structure looks like an elephant's trunk on an energy-time spectrogram, with the energy of the peak flux decreasing Earthward. The trunks are present in He+ and O+ ions but not in H+. During the event, ion energies in the He+ trunk, located at L = 3.6–2.6, magnetic local time (MLT) = 9.1–10.5, and magnetic latitude (MLAT) = −2.4–0.09°, vary monotonically from 3.5 to 0.04 keV. The values at the two end points of the O+ trunk are energy = 4.5–0.7 keV, L = 3.6–2.5, MLT = 9.1–10.7, and MLAT = −2.4–0.4°. Results from backward ion drift path tracings indicate that the trunks are likely due to (1) a gap in the nightside ion source or (2) greatly enhanced impulsive electric fields associated with elevated geomagnetic activity. Different ion loss lifetimes cause the trunks to differ among ion species.
    Citation
    Zhang, J.-C., Kistler, L.M., Spence, H.E., et al.. "“Trunk-like” heavy ion structures observed by the Van Allen Probes." Journal of Geophysical Research: Space Physics, 120, no. 10 (2015) Wiley: 8738-8748. http://dx.doi.org/10.1002/2015JA021822.
    Published Version
    http://dx.doi.org/10.1002/2015JA021822
    Type
    Journal article
    Publisher
    Wiley
    Citable link to this page
    https://hdl.handle.net/1911/94237
    Rights
    Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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    • Faculty Publications [4990]
    • Physics and Astronomy Publications [1771]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map