Abstract
Dayside auroral activities above Ny Alesund, Spitzbergen, and related magnetic field variations on the ground are examined. It is shown that the typical auroral activity in the dayside cusp is a local short-lived enhancement of east-west movement of auroral structures associated with some tendency of poleward expansion. This auroral activity is often associated with a magnetic impulsive variation. The deflection of the magnetic impulse is northward when the concurrent auroral movement is westward, and conversely, it is southward when the auroral structures move eastward. The magnetic impulses also show the clockwise polarization. The principal magnetic deflection can be understood in terms of electric current along the auroral arc when the auroral movements are due to electric drifts. The source of the clockwise polarization is not yet specified.
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