Microstructures in type III events in the solar wind |
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Authors: | D B Melrose M V Goldman |
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Institution: | (1) School of Physics, University of Sydney, Australia;(2) Present address: Dept. of Astrophysical, Planetary and Atmospheric Sciences, University of Colorado, 80309 Boulder, CO, USA |
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Abstract: | A model is presented for the generation and evolution of bump-in-tail driven Langmuir waves in the solar wind during type III emission, which removes a number of apparent inconsistencies between theory and observations. It is argued that there must be localized enhancements of f
b
/ v
by a factor of 102 over the measured average values. Growth rates and energy densities of Langmuir waves are, therefore, considerably enhanced, permitting growth to overcome linear scattering losses, and also allowing nonlinear decay into ion-acoustic waves, in line with observations. Estimates are made of the probability distribution p(E), of wave field strengths E, based on linear and nonlinear wave-packet evolution, yielding p(E) E
–a, 3. This helps explain why very high values of E are rarely found in the measured spiky wave turbulence. |
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Keywords: | |
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