Physics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...96..157h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 96, March 1985, p. 157-179.
Physics
16
Electrostatic Waves, Magnetohydrodynamic Stability, Plasma Radiation, Solar Corona, Solar Radio Bursts, Absorption Spectra, Distribution Functions, Electron Energy, Electron Gas, Landau Damping, Magnetically Trapped Particles, Maxwell-Boltzmann Density Function, Plasma Turbulence, Solar Magnetic Field, Temperature Distribution
Scientific paper
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 (alpha of about 45 deg) 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.
Hewitt R. G.
Melrose Donald B.
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