Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1279r&link_type=abstract
Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1279-1289.
Physics
16
Bow Waves, Electrostatic Waves, Ionic Waves, Magnetic Disturbances, Plasma-Particle Interactions, Solar Terrestrial Interactions, Solar Wind, Electric Fields, Electron Oscillations, Energetic Particles, High Energy Electrons, Ion Acoustic Waves, Plasma Oscillations, Plasma Resonance, Propagation Modes, Proton Energy, Shock Fronts, Shock Wave Interaction, Wave Scattering
Scientific paper
The electrostatic ion waves with frequencies between 0.5-6 kHz that are detected in the solar wind upstream of the bow shock are correlated with the energetic protons emitted from the bow shock along solar wind magnetic field lines. The upstream distribution of the ion waves demonstrates an association with the average bow shock position and with the statistically favored orientation of the upstream magnetic field. Individual ion wave events are correlated with low frequency (0.01-0.1 Hz) magnetic field waves which are known to be correlated with upstreaming 4-7 keV protons. A common origin is thus implied for both kinds of waves. It is suggested that the electrostatic ion waves are initially sporadically excited by upstreaming electrons with energies of approximately 1 keV and subsequently amplified to an enhanced level by Landau resonance with the upstreaming 4-7 keV protons. The ion waves may be Buneman-like in that they are consistent with waves of characteristic frequency of about 3.5 Hz and wavelengths of about 1 km. Electron plasma oscillations, associated with the upstreaming electrons, often appear to be anticorrelated with the ion waves, implying some interaction that damps electron plasma oscillations.
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