Electron trapping in large amplitude whistlers

Details Electron trapping in large amplitude whistlers Electron trapping in large amplitude whistlers

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51c..01k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM51C-01

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

A search of the data from the entire earth orbiting part of the Wind mission has found five episodes of large amplitude whistlers, comparable to those seen by STEREO B, that is with electric fields of the order of 100 mV/m. All of the large amplitude whistlers show evidence of electron trapping, and one of the episodes and the STEREO episode were sampled at rates allowing a detailed study of the waveforms. The whistlers are oblique and therefore have an electric field parallel to the wavevector whose potential does the trapping. The sheets of electrons trapped at a certain phase seriously perturb the waveforms, so that the ellipticity of the whistlers does not accurately determine the obliquity. However, the obliquity can be accurately determined from the electric field of the sheets. The obliquity is of the order of 45 degrees, At the time of the STEREO whistlers, STEREO was at a southern magnetic latitude of about -28 deg, and the whistlers were traveling away from the equator, as is expected. If it assumed that the trapped electrons do not seriously change the phase velocity of the whistlers, then the phase velocity parallel to B of the STEREO whistlers is about .25 c. The trapped electron energy is then in the range 10-20 keV.

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