Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..217m&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 217-222.
Physics
3
Electrostatic Waves, Heliosphere, Plasma-Electromagnetic Interaction, Radio Emission, Solar Wind, Electric Fields, Low Frequencies, Plasma Frequencies
Scientific paper
We present a model for the generation of Langmuir waves near the inner heliospheric shock. We further invoke the nonlinear interaction between the Langmuir waves resulting in electromagnetic radiation at the second harmonic of the plasma frequency, which is able to leave the source region. This model provides a quantitative explanation of the remote observation of radio emissions at 2-3 kHz by the Voyager plasma wave instrument in the outer heliosphere. If these radio emissions are generated by Langmuir waves, the Langmuir wave electric fields at the remote source are estimated to be 100-200 microvolts/m; the minimum value calculated assuming saturation of these emission processes is about 10 microvolts/m. The reality of the emissions detected by the Voyager plasma wave instrument, the location of the source, and expected in situ observation of the heliospheric shock are also discussed.
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