A new radio emission at 3 kHz in the outer heliosphere.

Physics

Scientific paper

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Interplanetary Plasma:Radio Radiation, Radio Radiation:Interplanetary Plasma

Scientific paper

Evidence of a radio source in the outer heliosphere is given based on observations made by the plasma wave receivers on Voyagers 1 and 2 at heliocentric radial distances ranging from 13 to 20 AU. The radio emission is observed in the frequency range of 2 to 3 kHz, and is above the local electron plasma frequency. The maximum spectral density of the emission recorded to date is about 10-14V2m-2Hz-1. The bandwidth of the radio noise is about 1 kHz. One of several possible sources considered for the emission is radiation at the second harmonic of the plasma frequency at the heliopause. Should this interpretation be correct, the data reported represent the first remote observations of the heliopause.

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