Third plasma harmonic radiation in type 2 bursts

Details Third plasma harmonic radiation in type 2 bursts Third plasma harmonic radiation in type 2 bursts

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9212982k&link_type=abstract

Unknown

Physics

Harmonic Radiation, Plasma Radiation, Type 2 Bursts, Coronas, Shock Waves, Solar Wind

Scientific paper

Some observational evidence for simultaneous fundamental, second, and third harmonic radio emission during an excessively strong type II burst on February 16, 1984 is presented. This burst was emitted from an active region behind the limb allowing for good resolution of the wave bands. Three different nearly equally probable mechanisms for higher harmonic emission are qualitatively discussed, however, preferred choice is given either to a four wave process which involves very strong Langmuir waves and a decay process for higher harmonic emission near the Earth's bow shock or Langmuir wave collapse. In sufficiently strong coronal shock waves both mechanisms may even be more efficient than under solar wind conditions. Langmuir wave collapse may be driven by strong electron beams. Observations like the present one should open additional diagnostic opportunities and should stimulate further search for higher than second harmonic emission in strong solar radio bursts.

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