Pseudobreakups during January 10, 1997

J. K. Arballo, B. T. Tsurutani, X. -Y. Zhou, G. S. Lakhina, C. M. Ho, Y. Kamide, J. -H. Shue, S. -I. Akasofu, R. P. Lepping, A. S. Sharma, C. C. Goodrich, K. Papadopoulos, and J. Lyon

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California


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 pseudobreakup (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 associated with electrons causing the auroral brightenings.

Proceedings of the International Conference on Substorms-4, Vol. 238, ed. S. Kokubun and Y. Kamide, pg. 315, 1998