Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms

Details Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0477k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0477

Physics

2752 Mhd Waves And Instabilities, 2768 Plasmasphere, 2788 Storms And Substorms

Scientific paper

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° ) and low (42° ) 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.

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