The 2f/p/ circumterrestrial radio radiation as seen from ISEE 3

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bow Waves, Extraterrestrial Radiation, Radio Emission, Shock Waves, Spaceborne Astronomy, International Sun Earth Explorer 3, Magnetopause, Plasma Frequencies, Solar Terrestrial Interactions, Time Response

Scientific paper

A narrowband highly spin-modulated radio source has been observed with the radio astronomy experiment on ISEE 3 from a position 0.01 AU upstream of the earth. The source is interpreted as radio line emission generated at twice the local plasma frequency in the vicinity of the earth's bow shock by energetic particles. The bandwidth of the 2f(p) emission varies from less than 3 kHz to more than 20 kHz and is probably broadened by solar wind density variations across the source region. The 2f(p) source is visible about 50% of the time, and the true position of its centroid is usually located within 30 earth radii of the subsolar point, but at times is observed at a distance of up to 60 earth radii. But most of these variations might result from changes in the orientation of the polarization vector in a partially polarized source or from refraction across an electron density front.

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