The downshift of electron plasma oscillations in the electron foreshock region

Details The downshift of electron plasma oscillations in the electron foreshock region The downshift of electron plasma oscillations in the electron foreshock region

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3935f&link_type=abstract

(American Geophysical Union, Chapman Conference on Collisionless Shock Waves in the Heliosphere, Napa Valley, CA, Feb. 20-24, 19

Physics

70

Bow Waves, Electron Plasma, Plasma Oscillations, Plasma-Particle Interactions, Solar Wind, Space Plasmas, Boundary Layer Plasmas, Doppler Effect, Electron Density (Concentration), International Sun Earth Explorer 1, Interplanetary Magnetic Fields, Plasma Frequencies, Polarization (Waves)

Scientific paper

Electron plasma oscillations in the earth's electron foreshock region are observed to shift above and below the local electron plasma frequency. As plasma oscillations shift downward from the plasma frequency, their bandwidth increases and their wavelength decreases. Observations of plasma oscillations well below the plasma frequency are correlated with times when ISEE 1 is far downstream of the electron foreshock boundary. Although wavelengths of plasma oscillations below the plasma frequency satisfy k x lambda-De approximately 1 the Doppler shift due to the motion of the solar wind is not sufficient to produce the observed frequency shifts. A beam-plasma interaction with beam velocities on the order of the electron thermal velocity is suggested as an explanation for plasma oscillations above and below the plasma frequency. Frequency, bandwidth, and wavelength changes predicted from the beam-plasma interaction are in good agreement with the observed characteristics of plasma oscillations in the foreshock region.

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