The ionospheric signatures of flux transfer events and solar wind dynamic pressure changes

Details The ionospheric signatures of flux transfer events and solar wind dynamic pressure changes The ionospheric signatures of flux transfer events and solar wind dynamic pressure changes

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517113l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17113-17135.

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97

Auroral Zones, Earth Ionosphere, Flux Transfer Events, Magnetopause, Solar Terrestrial Interactions, Solar Wind, Wind Pressure, Bursts, Daytime, Eiscat Radar System (Europe)

Scientific paper

Recent observations of vortical flow patterns in the dayside auroral ionosphere are discussed in terms of two alternative mechanisms: (1) the time-dependent magnetic reconnection in 'flux transfer events' (FTEs); and (2) the action of solar wind dynamic pressure changes at the magnetopause. It is argued that the ionospheric flow signature of an FTE should be a twin vortex, with the mean flow velocity in the central region of the pattern being equal to the velocity of the pattern as a whole. On the other hand, the pulse of enhanced or reduced dynamic pressure is also expected to produce a twin vortex, but with the central plasma flow being generally different in speed from (and almost orthogonal to) the motion of the whole pattern. It is found that, while none of the events discussed here are consistent with the theories of the effects of the dynamic pressure changes, all are well explained in terms of the ionospheric signatures of FTEs.

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