The 'head-on' approximation in second harmonic plasma emission

Details The 'head-on' approximation in second harmonic plasma emission The 'head-on' approximation in second harmonic plasma emission

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..151m&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 151-158.

Astronomy and Astrophysics

Astronomy

11

Plasma Radiation, Radio Astronomy, Solar Radio Emission, Approximation, Electrostatic Waves, Harmonic Functions, Plasma Frequencies, Power Spectra, Solar Corona, Transverse Waves, Type 3 Bursts

Scientific paper

Second-harmonic plasma emission is analyzed for isotropic Langmuir waves without adopting the 'head-on' approximation. The ratio between the actual power radiated and that predicted by the head-on approximation is calculated for power-law, 'broad', and 'narrow' spectra. It is shown that the head-on approximation always overestimates the radiated power. An application to type III solar radio emission demonstrates that the head-on approximation leads to an overestimate of the power by at least a factor of 2 and to an overestimate by several orders of magnitude for very narrow Langmuir spectra.

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