HR: 1340h
AN: SM33A-1245 [Abstracts]
TI: ULF Wave Activity in the Terrestrial Polar Cap and Polar Cap Boundary Regions as Observed by
Cluster
AU: * Puhl-Quinn, P A
EM: pamela.puhlquinn@unh.edu
AF: University of New Hampshire, Space Science Center
39 College Rd., Durham, NH 03824
United States
AU: Matsui, H
EM: hiroshi.matsui@unh.edu
AF: University of New Hampshire, Space Science Center
39 College Rd., Durham, NH 03824
United States
AU: Paschmann, G
EM: goetz.paschmann@mpe.mpg.de
AF: Max-Planck-Institute for Extraterrestrial Physics, Postfach 1312, Garching, 85741
Germany
AU: Bouhram, M
EM: bouhram@mpe.mpg.de
AF: Max-Planck-Institute for Extraterrestrial Physics, Postfach 1312, Garching, 85741
Germany
AU: Glassmeier, K
EM: glassmeier@t-online.de
AF: Institute for Geophysics and Meteorology, Mendelssohnstr. 3, Braunschweig, 38106
Germany
AU: Georgescu, E
EM: eg@mpe.mpg.de
AF: Max-Planck-Institute for Extraterrestrial Physics, Postfach 1312, Garching, 85741
Germany
AB:
Ultra-low frequency (ULF) wave activity over the northern and southern terrestrial polar caps and at polar cap boundary
regions is analyzed using Cluster Electron Drift Instrument (EDI), Flux Gate Magnetometer (FGM) and Cluster Ion Spectrometry
(CIS) data. The February and March Cluster orbits lie mainly in the noon-midnight meridional plane with perigee at midnight.
The open, polar cap for these orbits is bounded on one side by the nightside plasmasheet boundary layer and on the other by
the dayside, high-latitude, poleward cusp boundary. Preliminary statistics of oscillation characteristics for the February
and March orbits of 2001-2004 are presented. These statistics, as well as selected, energetic events, suggest an
organization of the data in terms of three main magnetic field line topologies: those field lines adjacent to the poleward
dayside cusp, those extending into the tail-lobe, and those adjacent to the nightside plasmasheet boundary layer. Possible
source mechanisms suggested by this organization are discussed.
DE: 2752 MHD waves and instabilities
DE: 2760 Plasma convection
DE: 2776 Polar cap phenomena
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting