Foreshock theories for the outer heliospheric radio emissions

Details Foreshock theories for the outer heliospheric radio emissions Foreshock theories for the outer heliospheric radio emissions

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..205c&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 205-208.

Computer Science

4

Electrostatic Waves, Heliosphere, Shock Wave Interaction, Solar Radio Emission, Solar Wind, Plasma Density, Transient Response

Scientific paper

Progress made on recent theories for the 2-3 kHz radio emissions in the outer heliosphere is summarized. The theories involve radiation produced near f(p) and/or 2f(p), by nonlinear processes involving Langmuir waves, when solar wind density enhancements enter the foreshock region sunwards of the termination shock. Two classes of events have been detected by Voyager: transient drifting emissions and a relatively continuous 2 kHz component. Foreshock theories for both types of emissions are presented and discussed, with emphasis placed on the role of density inhomogeneities. Our conclusions are as follows. (1) The levels and characteristics of the transient events are consistent with the expectations of the foreshock theory. The source may be located outside 50 AU. (2) The higher foreshock wave levels and enhanced density regions associated with stream-stream interactions in the outer heliosphere provide rationales for McNutt's trigger hypothesis. (3) A foreshock theory cannot easily account for the 2 kHz component's almost constant frequency range. Explanations in terms of steady density enhancements or an alternative source region and/or emission mechanism should be sought.

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