Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh24a..08b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH24A-08
Other
7534 Radio Emissions, 7829 Kinetic Waves And Instabilities, 7847 Radiation Processes
Scientific paper
We use measurements from the Wind spacecraft to study Langmuir wave growth in the source region of four separate in situ interplanetary type III bursts. Velocity distributions of energetic electron are used to compute the advection beam speed and growth rate (in the cold beam approximation) and these beam speeds and growth rates are compared with Langmuir wave activity and detailed features of the Langmuir wave spectra and waveforms. Knowledge of the electron beam speed lets us compute the resonant wavenumber and the expected spacecraft frequency of both daughter Langmuir waves and ion acoustic waves required for the parametric decay process. We find no strong evidence for decay products nor carrier splitting that is consistent with parametric decay. On the other hand, many of the Langmuir waveforms show 'polarization' signatures that may be consistent with linear mode conversion or trapped eigenmode interpretations of type III wave processes.
Bale Stuart D.
Krucker Sa"m
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