Low-frequency radio emissions in the outer heliosphere

Details Low-frequency radio emissions in the outer heliosphere Low-frequency radio emissions in the outer heliosphere

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.3801m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, March 1, 1991, p. 3801-3806. Research supported by Polish Academy of

Physics

13

Heliosphere, Low Frequencies, Plasma Waves, Radio Emission, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Annual Variations, Bows, Brightness Temperature, Electron Beams, Radio Waves, Solar Wind

Scientific paper

Progress is reported toward a model for the 2 and 3 kHz radio waves observed by Voyagers 1 and 2 during the 1983-1987 interval at radial distances from the sun of 17 and 13 AU, respectively. The brightness temperature and range of the volume emissivity for the radiation are calculated, and the results are compared with the characteristics of known radiation at multiples of the plasma frequency. The derived brightness temperatures are used to constrain the source of the Langmuir waves required to generate the observed emission and to rule out certain emission mechanisms. Minimum values of 3-30 micro-V/m are derived for the Langmuir wave electric field intensity and are found to be in reasonable agreement with observed values at planetary bow shocks. Path lengths required for the radiation to reach the observed levels are derived and discussed. The relevance of these ideas to possible direct observations of heliospheric boundaries is addressed.

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