Nonlinear stability of solar type III radio bursts. II - Application to observations near 1 AU

Details Nonlinear stability of solar type III radio bursts. II - Application to observations near 1 AU Nonlinear stability of solar type III radio bursts. II - Application to observations near 1 AU

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..683g&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 683-695. Navy-supported research.

Astronomy and Astrophysics

Astrophysics

28

Electron Plasma, Electrostatic Waves, Magnetohydrodynamic Stability, Plasma Turbulence, Type 3 Bursts, Electronic Spectra, High Energy Electrons, Mathematical Models, Solar Wind, Turbulence Effects

Scientific paper

A set of rate equations including strong turbulence effects and anomalous resistivity are solved using parameters which model several solar type III bursts. Analysis of these bursts has led to quantitative comparisons between several of the observed phenomena and the theory. Through use of an analytic model for the time evolution of the energetic electron exciter, it is found that the exciter distributions observed at 1 AU are unstable to the excitation of the linear bump-in-tail instability, amplifying Langmuir waves above the threshold for the oscillating two-stream instability (OTSI). The OTSI and the attendant anomalous resistivity produce a rapid spectral transfer of Langmuir waves to short wavelengths, out of resonance with the electron exciter. In addition, the various parameters needed to model the bursts are extrapolated inside 1 AU with similar results. Finally, reabsorption of the Langmuir waves by the beam is shown to be unimportant in all cases, even at 0.1 AU.

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