Generation of intermediate drift bursts in solar type IV radio continua through coupling of whistlers and Langmuir waves

Details Generation of intermediate drift bursts in solar type IV radio continua through coupling of whistlers and Langmuir waves Generation of intermediate drift bursts in solar type IV radio continua through coupling of whistlers and Langmuir waves

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44..173k&link_type=abstract

Solar Physics, vol. 44, Sept. 1975, p. 173-193.

Physics

51

Electrostatic Probes, Solar Magnetic Field, Solar Radio Bursts, Whistlers, Drift Rate, Lines Of Force, Magnetic Flux, Magnetohydrodynamic Waves, Phase Velocity, Wave Packets

Scientific paper

The paper elaborates the possible generation of intermediate drift bursts in type IV decimeter continua through coupling between whistler waves traveling along the magnetic field and Langmuir waves excited by a loss-cone instability in the source region. The generation, propagation and coupling of whistlers is investigated. It is shown that the superposition of an isotropic background plasma of 1 million K and a loss-cone distribution of fast electrons is unstable for whistler waves if the loss-cone aperture is sufficiently large; a typical value of the excited frequencies is 0.1 times the angular electron cyclotron frequency. The whistlers can travel upwards through the source region of the continuum along the magnetic-field direction with velocities of 21.5 to 28 times the Alfven velocity. Coupling of the whistlers with Langmuir waves into escaping electromagnetic waves can lead to the observed intermediate drift bursts if the Langmuir waves have phase velocities approaching the velocity of light. In the model, the instantaneous bandwidth of the intermediate drift bursts leads to estimates of the magnetic-field strength in the source region. These estimates are in good agreement with those derived from the observed drift rate if a simple hydrostatic density model is used.

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