AbstractPolar UV image and Astrid-2 electric and magnetic field data are used to study the evolution of the electrodynamical configuration of the high-latitude ionosphere during a 5-h transpolar arc event. During the course of the event we observe Sunward convection in narrow regions associated with pairs of upward and downward transpolar arc-related field-aligned currents. We also observe Sunward convection deriving from more remotely located field-aligned currents as well as stagnant convection in the centre of the polar region associated with a decoupling of the dawn and dusk side current systems. Schematic pictures of the current closure and convective flows are presented for a variety of configurations. The different states evolve naturally into each other and do not represent fundamentally different magnetospheric configurations.


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    Titel :

    Electrodynamics of transpolar aurorae


    Beteiligte:
    Blomberg, L.G. (Autor:in) / Cumnock, J.A. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 36 , 10 ; 1785-1790


    Erscheinungsdatum :

    2004-06-01


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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