Frequency drift of 3-kHz interplanetary radio emissions - Evidence of Fermi accelerated trapped radiation in a small heliosphere?

Details Frequency drift of 3-kHz interplanetary radio emissions - Evidence of Fermi accelerated trapped radiation in a small heliosphere? Frequency drift of 3-kHz interplanetary radio emissions - Evidence of Fermi accelerated trapped radiation in a small heliosphere?

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.344..640c&link_type=abstract

Nature (ISSN 0028-0836), vol. 344, April 12, 1990, p. 640, 641.

Physics

Optics

32

Extraterrestrial Radio Waves, Frequency Shift, Interplanetary Medium, Radiation Trapping, Shock Wave Interaction, Computerized Simulation, Cosmic Rays, Geometrical Optics, Heliosphere, Interstellar Matter, Solar Wind

Scientific paper

It is argued here that the well-known interplanetary radio emission of 2-3 kHz is trapped in the electromagnetic cavity formed by the heliopause, and furthermore that the fluctuating solar wind will cause the frequency of this trapped radiation to increase at a rate dependent on the geometry of the cavity. Applying this interpretation to the previously unexplained frequency drift amounting to about 1 kHz/yr of the 3-kHz burst, an average helipause distance of 60-100 AU is estimated. This agrees with recent data from Pioneer 10 and Voyager 2, suggesting that the termination shock is located at a distance of about 50 AU, and implies that Voyager 1 may reach the shock in about 1993 and the heliopause as early as 1996.

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