Abstract:
The January 10, 1997 interplanetary pressure pulse (observed at 0053 UT at Wind) caused a dayside aurora, as seen in Polar Ultraviolet Imager (UVI) data that propagates tailward and to lower L. After the solar wind has propagated -150 Re, downtail, a substorm pseu-dobreakup (PB) was detected at 68" N magnetic latitude, at local midnight. The PB dimmed on time scales of minutes and rebrightened 9 min. later. This happened several times in succession. A quasiperiod of approximately 10 min. was noted. The scale size of the PBs was -200 by 200 km in the ionosphere and there was no evidence of eastward drifts of the electrons causing the aurorat brightening.