Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.7613l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A5, p. 7613-7626
Other
16
Auroras, Geomagnetism, Magnetic Field Reconnection, Magnetohydrodynamic Flow, Magnetosheath, Pulses, Surges, All Sky Photography, Daytime, Earth Ionosphere, Eiscat Radar System (Europe), Magnetopause
Scientific paper
Longitudinal flow bursts observed by the European Incoherent Scatter (EISCAT) radar, in association with dayside auroral transients observed from Svalbard, have been interpreted as resulting from pulses of enhanced reconnection at the dayside magnetopause. However, an alternative model has recently been proposed for a steady rate of magnetopause reconnection, in which the bursts of longitudinal flow are due to increases in the field line curvature force, associated with the B(sub y) component of the magnetosheath field. We here evaluate these two models, using observations on January 20, 1990, by EISCAT and a 630-nm all-sky camera at Ny Alesund. For both models, we predict the behavior of both the dayside flows and the 630-nm emissions on newly opened field lines. It is shown that the signatures of steady reconnection and magnetosheath B(sub y) changes could possibly resemble the observed 630-nm auroral events, but only for certain locations of the observing site, relative to the ionospheric projection of the reconnection X line: however, in such cases, the flow bursts would be seen between the 630-nm transients and not within them. On the other hand, the model of reconnection rate pulses predicts that the flows will be enhanced within each 630-nm transient auroral event. The observations on January 20, 1990, are shown to be consistent with the model of enhanced reconnection rate pulses over a background level and inconsistent with the effects of periodic enhancements of the magnitude of the magnetosheath B(sub y) component. We estimate that the reconnection rate within the pulses would have to be at least an order of magnitude larger than the background level between the pulses.
Cowley Stan W. H.
Lockwood Marian
Lovhaug Unni-Pia
Sandholt Per Even
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