Computer Science
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confq.105m&link_type=abstract
Polish Academy of Sciences, International Solar Wind 8 Conference, p. 105
Computer Science
Heliosphere, Plasma Waves, Solar Wind, Radio Emission, Solar Radiation, Shock Wave Interaction, Plasma Interactions, Cosmic Rays, Electron Beams, Field Strength, Low Frequencies, Nonlinearity, Thermal Emission, Voyager Project
Scientific paper
The question of how low-frequency non-thermal radio emissions at the boundary of the heliosphere might be generated is considered. The mechanism consists of two steps. First, the beam of energetic electrons generates a high level of electrostatic Langmuir plasma waves. Second, electromagnetic radiation results from the non-linear interaction between Langmuir waves. Intensity of radio emissions at 2 to 3 kHz detected by the Voyager plasma wave instrument in the outer heliosphere can be explained provided that the electron beams generating Langmuir waves exist also in the postshock plasma due to secondary shocks in the compressed solar wind beyond the termination shock. Modification of the heliospheric shocks by the cosmic ray pressure is also taken into account. The field strengths of Langmuir waves required to generate the second harmonic emissions are of 50 to 100 microvolts per meter. These waves may be observed in situ by Voyager 1 and 2 in the near future.
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