Clumpy Langmuir waves in type III radio sources - Comparison of stochastic-growth theory with observations

Details Clumpy Langmuir waves in type III radio sources - Comparison of stochastic-growth theory with observations Clumpy Langmuir waves in type III radio sources - Comparison of stochastic-growth theory with observations

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..790r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 2, p. 790-800.

Astronomy and Astrophysics

Astrophysics

95

Electrostatic Waves, Stochastic Processes, Type 3 Bursts, International Sun Earth Explorer 3, Monte Carlo Method

Scientific paper

Detailed comparisons are made between the Langmuir-wave properties predicted by the recently developed stochastic-growth theory of type III sources and those observed by the plasma wave experiment on ISEE 3, after correcting for the main instrumental and selection effects. Analysis of the observed field-strength distribution confirms the theoretically predicted form and implies that wave growth fluctuates both spatially and temporally in sign and magnitude, leading to an extremely clumpy distribution of fields. A cutoff in the field-strength distribution is seen at a few mV/m, corresponding to saturation via nonlinear effects. Analysis of the size distribution of Langmuir clumps yields results in accord with those obtained in earlier work and with the size distribution of ambient density fluctuations in the solar wind. This confirms that the inhomogeneities in the Langmuir growth rate are determined by the density fluctuations and that these fluctuations persist during type III events.

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