HR: 09:45h
AN: SM21C-08    [Abstracts]
TI: Low-frequency Plasma Waves Within an AKR Source Region: Possible Wave Stimulation
AU: * Menietti, J D
EM: jdm@space.physics.uiowa.edu
AF: The University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242 United States
AU: Santolik, O
EM: ondrej.santolik@mff.cuni.cz
AF: Charles University, Faculty of Mathematics and Physics, Prague, CZ-18000 Czech Republic
AU: Scudder, J D
EM: jack-scudder@uiowa.edu
AF: The University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242 United States
AU: Mutel, R L
EM: robert-mutel@uiowa.edu
AF: The University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242 United States
AB: We report the results of an investigation of waves observed by the Cluster wideband instrument (WBD) during an orbital conjunction with the Polar spacecraft. During this perigee pass Polar was at the upper extent of the AKR source region in the southern hemisphere nightside auroral region, Cluster was located at higher altitude above this region and observed AKR with clear signatures of ordered fine structure striations (rain). Using electron particle data observed by HYDRA on board Polar, we have modeled the electron distribution function within the AKR source region, This distribution function is unstable to a number of low-frequency wave modes and supports EMIC waves propagating up the magnetic field line. We investigate the role of these waves in stimulating the growth of AKR and producing the ordered fine structure observed by WBD on board Cluster.
DE: 7867 Wave/particle interactions
DE: 2772 Plasma waves and instabilities
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting