Detailed study of electron plasma waves upstream of the earth's bow shock

Details Detailed study of electron plasma waves upstream of the earth's bow shock Detailed study of electron plasma waves upstream of the earth's bow shock

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6631e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Aug. 1, 1984, p. 6631-6653. Sponsorship: Centre National d'Etudes Spa

Physics

95

Bow Waves, Electron Plasma, High Energy Electrons, Magnetospheric Electron Density, Plasma Waves, Solar Wind, Doppler Effect, International Sun Earth Explorer 1, Landau Damping, Plasma Frequencies, Plasma Spectra, Spectrograms, Thermal Noise, Upstream

Scientific paper

A detailed study of electron plasma waves observed upstream of the earth's bow shock and of their relationships to the position of the satellite in the foreshock and to the electron measurements has been carried out. The wave characteristics depend on the position in the electron foreshock: a narrow-band (a few percent) and intense (a few millivolts per meter) noise is observed at the plasma frequency at the edge of the foreshock while the spectrum widens at the same time as the power decreases (hundreds of microvolts per meter) deeper (a few earth radii) inside the foreshock. Signals below the plasma frequency are also observed. These waves are polarized along the magnetic field, with long wavelengths below and at the plasma frequency and short wavelengths above it. They appear as short bursts, the duration of which depends on the frequency: longer close to the plasma frequency (50 ms), they shorten with increasing separation from the plasma frequency, the usual duration being 15 ms.

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