HR: 1340h
AN: SM23A-0477    [Abstracts]
TI: Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms
AU: * Kim, K
EM: khan@khu.ac.kr
AF: Kyung Hee University, Yongin, Kyunggi, 449-701 Korea, Republic of
AU: Takahashi, K
EM: kazue.takahashi@jhuapl.edu
AF: Johns Hopkins University, Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099 United States
AU: Lee, D
EM: dhlee@khu.ac.kr
AF: Kyung Hee University, Yongin, Kyunggi, 449-701 Korea, Republic of
AU: Sutcliffe, P
EM: psutclif@csir.co.za
AF: Hermanus Magnetic Observatory, Hermanus, Hermanus, 7200 South Africa
AU: Yumoto, K
EM: yumoto@serc.kyushu-u.ac.jp
AF: Kyushu University, Space Environment Research Center, Kyushu University, 53 6-10-1 Hakozaki, Fukuoka, 812-8581 Japan
AB: Pi2 pulsations during the intervals of extremely quiet geomagnetic conditions (Kp = 0+) have been reported by Sutcliffe and Lyons [2002]. These authors observed that several Pi2 bursts occurred simultaneously at high (magnetic latitude = $71\deg$) and low ($42\deg$) latitudes during the absence of magnetospheric substorms and found that the bursts are strongly correlated with poleward boundary intensifications (PBIs). The authors discussed the correlation between the PBI-associated Pi2 (PBI-Pi2) bursts and enhancements of energetic particle fluxes in the plasma sheet, but they did not focus on the wave properties of the PBI-Pi2 pulsations. In this study we examine whether the PBI-Pi2 pulsations at mid/low latitudes exhibit spatial variations similar to substorm-associated Pi2 pulsations. Using ground-based data from latitudinally and longitudinally extended magnetometer network and spacecraft data in the duskside, we discuss the spatial variation of the frequency, amplitude, phase, and inter-station coherence of the PBI-Pi2 pulsations.
DE: 2752 MHD waves and instabilities
DE: 2768 Plasmasphere
DE: 2788 Storms and substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting