Downshifted waves in electron foreshock region: Cluster observations and interpretation

Details Downshifted waves in electron foreshock region: Cluster observations and interpretation Downshifted waves in electron foreshock region: Cluster observations and interpretation

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh12a0422k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH12A-0422

Physics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

WHISPER measurements onboard four Cluster satellites during the Earth's bow shock crossing on January 24, 2001, have shown the presence of two types of high frequency electrostatic waves in the electron foreshock region: Langmuir and downshifted waves with the frequencies between electron and ion plasma frequencies. The downshifted waves are observed upstream of the shock front and they grow up just in the vicinity of the forward edge of the whistler precursor wave train. An analysis of electron distribution function does not show any signature of a high energy beam, however, it shows the growth of low-energy nonthermal electron fluxes. The electron distribution function integrated over the perpendicular velocity components does not have a resolution that is sufficient to identify unambiguously the presence of the beam-type feature, but gives an indication that a beam can exist. Theoretical analysis of the characteristics of the reflected electron population with the use of the measured magnetic and electric fields gives strong arguments in favor of such a hypothesis. Stability analysis shows that the two wave modes can be simultaneously generated due to a plasma-beam instability in a plasma, where the relative velocity of cold and hot components is comparable with the thermal velocity of the hot component. An estimate of the saturation level of the waves gives characteristic amplitudes which are similar to observed.

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