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Kim et al. 2005
Kim, K.-H., Lee, D.-H., Takahashi, K., Russell, C.T., Moon, Y.-J. and Yumoto, K. (2005). Pi2 pulsations observed from the Polar satellite outside the plasmapause. Geophysical Research Letters 32: doi: 10.1029/2005GL023872. issn: 0094-8276.

Recently, Lee and Lysak (1999) suggested that Pi2 pulsations in the inner magnetosphere originate from plasmaspheric virtual resonances (PVR). The PVR model predicts that Pi2 pulsations are not strictly localized to the plasmasphere. Until now there have been no spacecraft observations of the PVR mode outside the plasmasphere. Motivated by the theoretical work, we examine Pi2 pulsations simultaneously observed by the Polar satellite outside the plasmapause and at the low-latitude Kakioka (L = 1.3) station. We identify 14 events to have high coherence (> 0.7) between the compressional component (bz) in space and the horizontal component (H) at Kakioka during a 2-month period in 1997. The H-bz cross phase is ~180¿ regardless of the satellite's distance from the plasmapause. The amplitude of the Pi2 pulsations tends to decrease with the distance. On the basis of these observations, we conclude that the PVR mode is an appropriate model for our Pi2 events observed outside the plasmasphere.

BACKGROUND DATA FILES

Abstract

Keywords
Magnetospheric Physics, Magnetosphere, outer, Magnetospheric Physics, MHD waves and instabilities (2149, 6050, 7836), Magnetospheric Physics, Plasmasphere, Magnetospheric Physics, Magnetic storms and substorms
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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