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    Density duct formation in the wake of a travelling ionospheric disturbance: Murchison Widefield Array observations

    238946_238946.pdf (4.156Mb)
    Access Status
    Open access
    Authors
    Loi, S.
    Cairns, I.
    Murphy, T.
    Erickson, P.
    Bell, M.
    Rowlinson, A.
    Arora, Balwinder Singh
    Morgan, John
    Ekers, Ronald
    Hurley-Walker, Natasha
    Kaplan, D.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Loi, S. and Cairns, I. and Murphy, T. and Erickson, P. and Bell, M. and Rowlinson, A. and Arora, B. et al. 2016. Density duct formation in the wake of a travelling ionospheric disturbance: Murchison Widefield Array observations. Journal of Geophysical Research: Space Physics. 121 (2): pp. 1569-1586.
    Source Title
    Journal of Geophysical Research: Space Physics
    DOI
    10.1002/2015JA022052
    ISSN
    2169-9380
    School
    Curtin Institute of Radio Astronomy (Engineering)
    Remarks

    Copyright © 2016 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/23256
    Collection
    • Curtin Research Publications
    Abstract

    ©2016. American Geophysical Union. Geomagnetically aligned density structures with a range of sizes exist in the near-Earth plasma environment, including 10-100 km wide VLF/HF wave-ducting structures. Their small diameters and modest density enhancements make them difficult to observe, and there is limited evidence for any of the several formation mechanisms proposed to date. We present a case study of an event on 26 August 2014 where a travelling ionospheric disturbance (TID) shortly precedes the formation of a complex collection of field-aligned ducts, using data obtained by the Murchison Widefield Array (MWA) radio telescope. Their spatiotemporal proximity leads us to suggest a causal interpretation. Geomagnetic conditions were quiet at the time, and no obvious triggers were noted. Growth of the structures proceeds rapidly, within 0.5 h of the passage of the TID, attaining their peak prominence 1-2 h later and persisting for several more hours until observations ended at local dawn. Analyses of the next 2 days show field-aligned structures to be preferentially detectable under quiet rather than active geomagnetic conditions. We used a raster scanning strategy facilitated by the speed of electronic beamforming to expand the quasi-instantaneous field of view of the MWA by a factor of 3. These observations represent the broadest angular coverage of the ionosphere by a radio telescope to date.

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