Computer Science – Sound
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0431s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0431
Computer Science
Sound
2772 Plasma Waves And Instabilities (2471), 6984 Waves In Plasma (7867), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
We investigate the source region of whistler mode chorus using combined wave and particle measurements from the Cluster spacecraft. The source region is identified by the Poynting flux and electromagnetic planarity analysis using multicomponent measurements of three magnetic and two electric antennas. To investigate time-frequency properties of chorus/hiss wave emissions we analyze high-resolution waveforms recorded in the source region. We estimate stability of these waves and their possible source mechanisms using simultaneous measurements of the distribution functions of electrons with energies up to 27 keV. These measurements show the presence of time-energy dispersed injected electrons at energies of tens to hundreds of eV with a large temperature anisotropy, and a loss cone distribution due to the radiation belt electrons with energies < 27 keV. We use a parametric model of the electron distribution function, and we estimate parameters of this model from the measurements by a nonlinear maximum likelihood method. We also use active sounding measurements of the total plasma density to complete the model by including a cold core component. The derived electron distribution model is found to be able to provide a source of free energy for the growth of the observed whistler-mode waves.
Cornilleau-Wehrlin Nicole
Décréau Pierrette
Fazakerley Andrew
Gurnett Donald
Menietti J.
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