HR: 0830h
AN: SM21B-0205    [PDF]
TI: Global Analysis of Drift Compressional Modes
AU: * Crabtree, C E
EM: ccrabtree@uci.edu
AF: University of California Irvine, University of California Irvine Department of Physics & Astronomy 4129 Frederick Reines Hall, Irvine, CA 92697-4575 United States
AU: Chen, L
EM: liuchen@uci.edu
AF: University of California Irvine, University of California Irvine Department of Physics & Astronomy 4129 Frederick Reines Hall, Irvine, CA 92697-4575 United States
AB: The radial localization of drift compressional modes, drift waves dominated by the compressional component ($\delta B_{\|}$), is examined using WKB approximations in the radial direction. This method reduces the two-dimensional eigenvalue problem to two nested one-dimensional problems: an integral equation along the field line and a quantization condition in the radial direction as in {\it Vetoulis and Chen} [1996]. Individual flux-tubes were previously found to be unstable to compressional drift waves in two parameter regimes: (1) when magnetic guiding center drifts are opposite to the diamagnetic drift ($\omega_{*p}/\overline{\omega}_D<0$) and (2) when the temperature gradient is in the opposite direction to the density gradient ($\eta= L_n/L_T < 0$). The radial localization of drift compressional modes is important in assessing the role these modes play in magnetospheric substorms and high-$\beta$ laboratory devices.\\ \noindent This research was supported in part by an appointment to the U.S. Department of Energy Fusion Energy Postdoctoral Research Program administered by the Oak Ridge Institute for Science and Education
DE: 2720 Energetic particles, trapped
DE: 2772 Plasma waves and instabilities
DE: 2788 Storms and substorms
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting