Type III bursts in interplanetary space - Fundamental or harmonic?

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Harmonic Radiation, International Sun Earth Explorer 3, Interplanetary Space, Plasma Radiation, Plasma Waves, Solar Wind, Type 3 Bursts, Brightness Temperature, Kilometric Waves, Radiant Flux Density, Solar Electrons

Scientific paper

The authors study type III bursts in the solar wind using observations of 120 relatively simple, intense and isolated bursts that were observed on the ISEE-3 spacecraft in the frequency range 30 to 1980 kHz. There are a number of bursts whose trajectories encounter the spacecraft and fast electrons and Langmuir waves are observed. For these, and for radio frequencies near the local plasma frequency, the evidence is strong that radio emission is at the fundamental from burst onset until about the time of burst peak. Further, the fundamental emission begins in time coincidence with the start of the Langmuir waves. This finding should remove any doubt about the conventional belief that Langmuir waves are responsible for type III bursts.

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