Abstract
We investigated the characteristics of auroral precipitating particles associated with a brightened arc at a pseudo‐substorm, using auroral images of a high‐time resolution (0.25 s) all‐sky TV camera, particle data from the DMSP F10 spacecraft, and high‐latitude magnetograms. The arc brightening occurred at 0407 UT (∼20 MLT) on December 30, 1994, at Fort Smith (67 MLAT), Canada, coincident with high‐latitude Pi 2 magnetic pulsations. The brightening appeared without expansion (pseudo‐breakup), and Fort Smith was located duskside of the main onset region. From the simultaneous DMSP particle data, the brightened arc is found to correspond to an electron inverted‐V structure near the equatorward edge of the electron precipitation region, suggesting the pseudo‐breakup of the auroral substorm occurred in the inner part of the plasma sheet.
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