HR: 17:45h
AN: SM32D-08    [PDF]
TI: Statistical Studies of Foreshock Langmuir Wave Amplitudes
AU: * Sigsbee, K
EM: kms@beta.physics.uiowa.edu
AF: Department of Physics and Astronomy, 203 Van Allen Hall, University of Iowa, Iowa City, IA 52242 United States
AU: Kletzing, C A
EM: cak@delta.physics.uiowa.edu
AF: Department of Physics and Astronomy, 203 Van Allen Hall, University of Iowa, Iowa City, IA 52242 United States
AU: Gurnett, D A
EM: donald-gurnett@uiowa.edu
AF: Department of Physics and Astronomy, 203 Van Allen Hall, University of Iowa, Iowa City, IA 52242 United States
AU: Pickett, J S
EM: pickett@uiowa.edu
AF: Department of Physics and Astronomy, 203 Van Allen Hall, University of Iowa, Iowa City, IA 52242 United States
AU: Balogh, A
EM: a.balogh@ic.ac.uk
AF: Space and Atmospheric Physics Group, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
AU: Lucek, E
EM: e.lucek@ic.ac.uk
AF: Space and Atmospheric Physics Group, The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BW United Kingdom
AB: Between February 2001 and May 2002, more than 200 hours of data were recorded by the Cluster Wideband Data (WBD) Plasma Wave Receiver in the vicinity of Earth's foreshock. We will discuss the statistics of the amplitudes of Langmuir waves observed by the Cluster WBD Plasma Wave Receiver in the foreshock region. The largest amplitude Langmuir waves were observed by Cluster near the boundary between the foreshock and solar wind in a region approximately 1 R$_{E}$ wide, in agreement with earlier studies. The electric field amplitude probability distributions often follow a combination of the log-normal statistics predicted by stochastic growth theory and power law statistics when sorted by the distance from the foreshock boundary. Deviations from stochastic growth theory occur for large amplitude waves near the edge of the foreshock, where the probability distributions resemble a power law. Corrections to the probability distributions for non-optimal auto-ranging due to rapid waveform amplitude variations will be discussed.
DE: 2154 Planetary bow shocks
DE: 2159 Plasma waves and turbulence
DE: 2772 Plasma waves and instabilities
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting