Evidence for electrostatic decay in the solar wind at 5.2 AU

Physics – Plasma Physics

Scientific paper

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Space Plasma Physics: Turbulence, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities

Scientific paper

The Unified Radio and Plasma wave Experiment (URAP) on the Ulysses spacecraft provides in situ observations of Langmuir waves and ion-acoustic waves in the solar wind. The observations presented in this paper were obtained at 5.2 AU from the Sun. Low-frequency (20-200 Hz in the spacecraft frame) electric field signals are observed coincident in time with the most intense Langmuir waves. The low-frequency wave signals are identified as long-wavelength ion-acoustic waves. These observations provide evidence for the decay of Langmuir waves into daughter Langmuir and ion-acoustic waves (the electrostatic decay process) in the solar wind.

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