Traveling magnetospheric convection twin vortices - Another case study, global characteristics, and a model

Details Traveling magnetospheric convection twin vortices - Another case study, global characteristics, and a model Traveling magnetospheric convection twin vortices - Another case study, global characteristics, and a model

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3977g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 3977-3992.

Physics

80

Field Aligned Currents, Geomagnetism, Magnetohydrodynamic Waves, Magnetospheric Instability, Solar Terrestrial Interactions, Vortices, Convective Flow, Flux Transfer Events, Magnetic Variations, Magnetopause

Scientific paper

A transient geomagnetic field variation event associated with a traveling magnetospheric convection twin vortex is examined. At low dayside latitudes, magnetic field variations similar to SI variations are recorded. Almost simultaneous onset and no westward propagation are observed. Localized magnetic field reconnection as well as pressure pulses at the dayside magnetopause are discussed as possible source mechanisms of such transient events. The SI-like behavior of the event, its reverse sense of rotation, and the vortex-associated field-aligned current density excludes such localized magnetic reconnection as a possible source mechanism and argues in favor of the existence of pressure pulses at the magnetopause. It is shown that a spatially localized compression or dilation of the dayside magnetopause is also associated with the onset of a current flowing parallel or antiparallel to the magnetopause current, respectively.

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