High latitude Pi3 pulsations observed by the EISCAT VHF radar Original Research Article

Long period irregular magnetic pulsations, Pi3, are found from EISCAT/VHF radar observations at the high latitude in the dawn sector on Sept. 29, 1996. From the comparison between the radar and ground magnetometer data, it is suggested that the meandering of the auroral electrojet causes these pulsations. We have found that this meandering structure propagates duskward. The propagation velocity is estimated to be about 700 m/s. The scale of meandering structure is about 1000 km.