Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..547g&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 8, Aug. 1992, p. 547-565.
Physics
53
Auroras, Field Aligned Currents, Ionospheric Currents, Magnetic Field Reconnection, Magnetopause, Planetary Magnetospheres, Magnetic Effects, Magnetic Storms, Magnetometers, Particle Acceleration, Solar Terrestrial Interactions, Vortices
Scientific paper
Key observations concerning traveling magnetospheric convection twin-vortices (TMCTWs) are reviewed in detail with particular attention given to mechanisms for generating such twin-vortex systems, namely, magnetic reconnection and change of the magnetopause pressure balance. Twin-vortex structures are found to be associated with a pair of upward and downward flowing field-aligned current with densities up to 10 exp -9 A/sq m. Observations of dayside auroral activity support the hypothesis that large currents may eventually become unstable, and potentially lead to particle acceleration. It is concluded that isolated transient magnetic effects and associated with them TMCTWs are in many respects the dayside analog of the nightside substorm events.
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