The loss-cone driven instability for Langmuir waves in an unmagnetized plasma |
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| Authors: | R G Hewitt D B Melrose |
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| Institution: | (1) School of Physics, University of Sydney, 2006 Sydney, N.S.W., Australia |
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| Abstract: | Analytic and numerical results are presented for the growth rate of Langmuir waves due to a loss-cone distribution of energetic electrons. The effect of the magnetic field on the wave-particle interaction is ignored, and the resonance condition is described in terms of a resonance hyperboloid in momentum space. The collisional evolution of a distribution of magnetically trapped electrons is followed numerically to show how a  gap distribution develops. The growth is most favorable for an intermediate sized loss cone (  45 °) and a gap distribution in which the mean energy of the suprathermal electrons is much larger than the thermal energy of the background electrons. It is plausible that loss-cone gap distributions do develop in the solar corona, and that they should lead to second harmonic plasma emission weakly polarized in the x-mode. |
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