Outer heliospheric radio emissions. I - Constraints on emission processes and the source region

Details Outer heliospheric radio emissions. I - Constraints on emission processes and the source region Outer heliospheric radio emissions. I - Constraints on emission processes and the source region

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.6235c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A5, May 1, 1992, p. 6235-6244.

Astronomy and Astrophysics

Astronomy

21

Electrostatic Waves, Heliosphere, Low Frequencies, Plasma Interactions, Radio Emission, Radio Sources (Astronomy), Brightness Temperature, Electron Beams, Magnetohydrodynamic Stability, Plasma Frequencies, Plasma Turbulence, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Wave Interaction

Scientific paper

Observations by Voyager 1 and 2 of LF radio emissions near 2 and 3 kHz during the interval 1983-1987 while at heliocentric distances from 15 to 27 AU and 11 to 20 AU, respectively, are reported. Constraints on the emission processes and source characteristics are discussed. Minimum Langmuir wave electric fields in the source region, based solely on the kinematics of the radiation processes, lie in the range 1-100 micro-V/m for nominal source and electron beam parameters. Path lengths for fundamental and harmonic emission processes are calculated. The observed levels of radiation can be produced in path lengths and source dimensions smaller than 1 AU provided the participating Langmuir waves have effective temperatures of about 10 exp 17 K. Previous source models for the radiation are discussed.

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