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CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms

Wild, J. A. and Yeoman, T. K. (2000) CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms. Annales Geophysicae, 18 (6). pp. 640-652. ISSN 0992-7689

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    Abstract

    High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical fl ̄ow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (~800 m/s) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (~1 km/s) azimuthally away from the region of the ionosphere associated with the location of the substorm expansion phase onset. Furthermore, a statistical analysis drawn from over 1000 h of high-time resolution, nightside radar data has enabled the characterisation of the bulk properties of these vortical flow systems. Their occurrence with respect to substorm phase has been investigated and a possible generation mechanism has been suggested.

    Item Type: Article
    Journal or Publication Title: Annales Geophysicae
    Uncontrolled Keywords: magnetometer DCS-publications-id ; art-516 ; DCS-publications-credits ; samnet ; DCS-publications-personnel-id ; 104
    Subjects:
    Departments: Faculty of Science and Technology > School of Computing & Communications
    Faculty of Science and Technology > Physics
    ID Code: 10000
    Deposited By: Dr Steve Marple
    Deposited On: 24 Jun 2008 18:16
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 14:41
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/10000

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