A new radio emission at 3 kHz in the outer heliosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Heliosphere, Radio Sources (Astronomy), Solar Radio Emission, Very Low Frequencies, Plasma Waves, Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

Evidence of a radio source in the outer heliosphere based on observations made by the plasma wave receivers on Voyagers 1 and 2 at heliocentric radial distances ranging from 13 to 20 AU is given. The radio emission is observed in the frequency range 2 to 3 kHz, and is above the local electron plasma frequency whenever supporting plasma density data are available. The maximum spectral density of the emission is 10 to the minus 14 th power V sq/m/Hz. The bandwidth of the radio noise is 1 kHz. One possible source for the emission is radiation at the second harmonic of the plasma frequency at the heliopause.

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