Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..912b&link_type=abstract
Astrophysical Journal, vol. 209, Nov. 1, 1976, pt. 1, p. 912-926.
Astronomy and Astrophysics
Astrophysics
61
Electrostatic Waves, Magnetohydrodynamic Stability, Solar Electrons, Type 3 Bursts, Energy Transfer, Oscillating Flow, Solar Wind, Wave Equations, Wave Packets
Scientific paper
Assuming that type III solar radio bursts are associated with electron streams moving at about c/3, Langmuir waves should be strongly excited. A study is made of the Langmuir-wave linear parametric instabilities excited in cylindrical symmetry by an electron-stream-driven Langmuir wave-pump propagating along the stream axis. Included in this unified homogeneous treatment are induced backscattering off ions, the oscillating two-stream instability, and a new 'stimulated modulational instability,' previously unconsidered in this context. Near a few solar radii, the latter two deposit Langmuir-wave energy into a forward-scattering cone about the stream axis. It is concluded that the linear stage of the forward-scattering instabilities involves transfer of energy to Langmuir waves which remain in resonance with the stream, and therefore probably do not prevent rapid depletion of the electron stream due to quasi-linear plateau formation at these distances from the sun.
Bardwell S.
Goldman Martin V.
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