Microstructures in type III events in the solar wind

Details Microstructures in type III events in the solar wind Microstructures in type III events in the solar wind

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..107..329m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 107, no. 2, 1987, p. 329-350.

Physics

46

Electrostatic Waves, Ion Acoustic Waves, Microstructure, Solar Wind, Type 3 Bursts, Wave Packets, Liouville Theorem, Plasma Turbulence

Scientific paper

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 ∂fb/∂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-α, α ≥ 3. This helps explain why very high values of E are rarely found in the measured spiky wave turbulence.

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