Mathematics – Probability
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh51b1208s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH51B-1208
Mathematics
Probability
2139 Interplanetary Shocks, 2154 Planetary Bow Shocks, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions, 7868 Wave/Wave Interactions
Scientific paper
The characteristics of the Langmuir waves observed by the Cluster WBD Plasma Wave Receiver in different regions of the Earth's foreshock are presented. Foreshock Langmuir wave amplitude probability distributions can follow a combination of the log-normal statistics predicted by stochastic growth theory and power law statistics. Power law statistics often result from spatial averaging, but can also be found for large amplitude waves near the foreshock edge. This raises questions about the types of Langmuir wave behavior found in different regions of the foreshock. We will examine the significance of nonlinear interactions and other physical processes in the foreshock by considering the properties of Langmuir wave power spectra. Evidence for parametric decay has been found in the Earth's foreshock in the form of wave spectra with double peaks near the plasma frequency. Far downstream from the boundary between the foreshock and solar wind, Langmuir waves can shift up and down in frequency from the local plasma frequency. In the ion foreshock, waves near the plasma frequency appear to be influenced by ULF waves that cause variations in the local plasma density. Density gradients may cause mode conversion and the reflection of Langmuir waves. For selected cases, we will present the occurrence rates of these types of wave behavior in different regions of the foreshock. The thresholds for nonlinear processes in the foreshock will also be discussed.
Eastwood Jonathan P.
Fazakerley Andrew
Gurnett Donald A.
Kletzing Craig A.
Kucharek Harald
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