Formation of the wave compressional boundary in the earth's foreshock

Details Formation of the wave compressional boundary in the earth's foreshock Formation of the wave compressional boundary in the earth's foreshock

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311354s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 1, 1988, p. 11354-11362.

Physics

8

Bow Waves, Compressible Boundary Layer, Plasma-Particle Interactions, Shock Waves, Wave Excitation, Energetic Particles, Interplanetary Medium, Magnetohydrodynamic Waves, Protons, Solar Wind

Scientific paper

Using an evolutionary model and allowing for nonuniform proton injection and wave growth rates, the compressional wave boundaries corresponding to IMF inclinations to the solar wind of theta(BV) equal to 45 and 25 deg were located. The compressional boundaries deduced from this model were found to support the results of Greenstadt and Baum (1986) who have concluded that the observed compressional boundaries are incompatible with wave growth at a fixed growth rate, due to the interaction of a uniform beam with the solar wind. The results indicate, however, that the compressional boundaries are quite compatible with nonuniform beams and growth rates which result from the coupled evolution of the energetic protons and the waves with which they interact. It was found that, in the solar wind frame, the dominant wave-particle interaction in the outer foreshock is the damping of inward propagating (toward the shock) left-polarized waves, producing a magnetically quiet region immediately downstream of the foreshock boundary.

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