Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120..383m&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 120, no. 2, 1989, p. 383-391.
Physics
19
Solar Flares, Type 4 Bursts, Whistlers, Fine Structure, Magnetoacoustic Waves, Wave Packets
Scientific paper
An explanation is suggested for a special fine structure consisting of slowly drifting chains of narrowband fiber bursts that was first observed during the solar type IV radio burst on April 24, 1985. It is argued that this fine structure reflects the radio signature of whistler waves excited within a localized wave packet of the fast magnetosonic mode. A loss-cone distribution of energetic electrons superimposed upon a Maxwellian distribution, unstable only for loss-cone angles exceeding a critical value, is assumed to be the driver of the whistlers. The magnetic field variation associated with this wave packet shifts the local loss-cone angle beyond the critical value and triggers the excitation of the whistlers, finally coalescing with Langmuir waves into escaping electomagnetic waves. The high-energetic particles are scattered into the loss-cone by quasi-linear pitch angle diffusion, which suppresses the whistler excitation.
Baumgaertel K.
Chernov Gennady P.
Karlicky Marian
Mann Gottfried
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