A statistical study of the motions of auroral arcs in the high-latitude morning sector

Details A statistical study of the motions of auroral arcs in the high-latitude morning sector A statistical study of the motions of auroral arcs in the high-latitude morning sector

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10021979s&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A11, p. 21979-21986

Physics

13

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Motions of auroral arcs in the high-latitude morning sector (0300-0900 magnetic local time) have been studied statistically for magnetically quiet periods, using the data from all-sky images for two winters from two ground-based stations at magnetic latitudes (MLAT) of 84° and 78°. Most of the observed arcs are in a sun-aligned direction. Most of the arcs observed at 84° MLAT move duskward with a typical velocity of ~500 m/s. A similar duskward motion of the arcs with a slightly higher velocity is dominant at 78° MLAT, though some arcs move antisunward at this latitude. It is suggested that the observed duskward auroral motion is related to poleward shrinkage of the morningside oval on closed field lines during magnetically quiet conditions.

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