Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521095s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 21095-21109.
Physics
13
Auroras, F Region, Ionospheric Drift, Atmospheric Boundary Layer, Current Sheets, Daytime, Eiscat Radar System (Europe), Magnetosphere-Ionosphere Coupling
Scientific paper
Optical and ion drift observations related to a sequence of transient auroral events near 75 deg invariant latitude and 1400 MLT are discussed in terms of a simple dynamo model of the dayside low-latitude boundary layer as well as different time-dependent reconnection scenarios. The characteristic intermittent optical events, covering about 300 km in east-west extent, move eastward along the poleward boundary of the persistent background aurora at velocities of about 1.5 km/s. Breakup of discrete auroral forms occurs at the reversal that forms between eastward plasma flow, maximizing near the persistent arc poleward boundary and strong transient westward flow to the south. The reported events are embedded within a long-period of similar auroral activity between 0830 and 1300 UT. These observations are discussed in the context of recent models of boundary-layer plasma dynamics and associated magnetosphere-ionosphere coupling.
Farmer Dean A.
Lockwood Marian
Lybekk Bjørn
Sandholt Per Even
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