Mathematics – Probability
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh43a..15s&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH43A-15
Mathematics
Probability
2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2784 Solar Wind/Magnetosphere Interactions, 7839 Nonlinear Phenomena, 7868 Wave/Wave Interactions
Scientific paper
The characteristics of Langmuir waves observed by the Cluster WBD Plasma Wave Receiver in different regions of the Earth's foreshock are presented. Our previous work on waves in the electron foreshock has shown that the electric field amplitude probability distributions for Langmuir waves observed by Cluster can follow a combination of the log-normal statistics predicted by stochastic growth theory and power law statistics. Power law deviations from log-normal statistics are often the result of spatial averaging, but can also be found for large amplitude waves near the edge of the electron foreshock, which may show evidence of non-linearity. This raises questions about the possible effects of non-linear processes on the amplitude statistics. We examine the significance of non-linear processes in the foreshock by considering the various types of Langmuir wave power spectra observed in this region. Evidence for non-linear processes such as parametric decay, has been found in Earth's electron foreshock in the form of wave spectra with double peaks near the plasma frequency. Away from the boundary between the foreshock and solar wind, Langmuir waves have been observed to shift up and down in frequency from the local plasma frequency. Far downstream, in the ion foreshock, the behavior of waves near the plasma frequency appears to be influenced by the presence of ULF waves. For selected cases, we discuss the occurrence rates of these types of Langmuir wave spectra in different regions of the Earth's foreshock.
Balogh André
Gurnett Donald A.
Kletzing Craig A.
Lucek Elizabeth
Pickett Jolene S.
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