Ulysses observations of nonlinear wave-wave interactions in the source regions of type III solar radio bursts |
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| Authors: | G Thejappa R J MacDowall |
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| Institution: | (1) Department of Astronomy, University of Maryland, 20742 College Park, MD;(2) Goddard Space Flight Center, NASA, 20771 Greenbelt, MD |
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| Abstract: | The Ulysses Unified Radio and Plasma Wave Experiment (URAP) has observed Langmuir, ion-acoustic and associated solar type
III radio emissions in the interplanetary medium. Bursts of 50–300 Hz (in the spacecraft frame) electric field
signals, corresponding to long-wavelength ion-acoustic waves are often observed coincident in time with the most intense Langmuir
wave spikes, providing evidence for the electrostatic decay instability. Langmuir waves often occur as envelope solitons,
suggesting that strong turbulence processes, such as modulational instability and soliton formation, often coexist with weak
turbulence processes, such as electrostatic decay, in a few type III burst source regions. |
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| Keywords: | Type HI bursts electrostatic decay modulational instability |
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