Other
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..923m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Aug. 1989, p. 923-926. Research supported by NASA, Ministere des Affaire
Other
10
Interplanetary Medium, Kilometric Waves, Shock Waves, Solar Radio Bursts, Type 3 Bursts, Electron Acceleration, Electron Beams, Electron Energy, Interplanetary Magnetic Fields
Scientific paper
Interplanetary (IP) type-III bursts that undergo sudden intensity changes when their electron beams traverse the vicinity of an IP shock are examined. Three types of intensity changes are discussed: cutoffs in which the type-III intensity is abruptly reduced and remains at the reduced level for all lower frequencies, narrow-band intensifications that frequently occur on the high-frequency edge of a cutoff, and narrow-band intensity reductions. Pitch angle scattering of the beam electrons in the enhanced magnetic turbulence downstream of shocks is proposed as a principal cause of the intensity cutoffs and, possibly, the intensifications. These observations suggest that one type-III emission mode is frequently at least 10 times more intense than the other mode.
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