Are Microbursts Structureless?

Details Are Microbursts Structureless? Are Microbursts Structureless?

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.5601g&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #56.01; Bulletin of the American Astronomical Society, Vol. 24, p.820

Astronomy and Astrophysics

Astronomy

Scientific paper

Microbursts are of lowest brightness temperature of all the radio bursts in the meter-decameter wavelength regime. Since the low brightness temperature is a consequence of low level of Langmuir turbulence, it was thought that a nonlinear process such as the second harmonic plasma emission would be unimportant. The probable cause for low levels of Langmuir turbulence is the presence of isotropic density fluctuations in the corona which isotropize the beam-generated Langmuir waves. The isotropy of the Langmuir turbulence favors the head-on collision of plasma waves needed to satisfy the kinematic conditions of harmonic plasma emission. For reasonable beam parameters, we find that the second harmonic plasma emission always dominates; the fundamental brightness temperature never exceeds 10(6) K. Thus we conclude that the microbursts may be structureless. We also find that the microburst electron beams are no different from the normal type III electron beams.

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