Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..696r&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 696-706.
Astronomy and Astrophysics
Astrophysics
8
Electromagnetic Absorption, Magnetohydrodynamic Waves, Solar Activity, Solar Corona, Solar Radio Bursts, Absorptivity, Anisotropy, Isotropy, Pitch (Inclination), Plasma Radiation, Solar Wind
Scientific paper
The emission of Langmuir waves is extremely important in relation to the generation of meter wavelength radio bursts. The Langmuir wavenumber spectrum emitted from several representative electron distributions is discussed. For electrons having isotropic pitch angle distributions, the spectrum produced is well defined and determined primarily by the electron energy distribution. For anisotropic pitch angle distributions, induced emission may result, with consequent interaction between particles and waves. Both loss-cone and streaming distributions may cause Langmuir waves to be amplified. For the streaming distribution, this generation is primarily in the direction of streaming; for the loss-cone distribution, wave generation perpendicular to the field lines is favored.
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