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Another Clue About Particle Acceleration in Impulsive Hard X-Ray/Microwave Bursts

Published online by Cambridge University Press:  12 April 2016

David Batchelor
David Batchelor*
Affiliation:
Space Physics Data Facility, Code 632, NASA/Goddard Space Flight Center, Greenbelt, MD 20771

Abstract

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In a sample of impulsive bursts with rise times less than 30 s, a correlation between burst rise times and the frequency of maximum microwave emission has been found. The implications for source structure and dynamics are discussed in this paper. Previously evidence was found that such bursts are caused by some propagating disturbance such as a shock wave or thermal conduction front. Combining that evidence with the microwave and hard X-ray spectral information suggests that the most rapid bursts are emitted from the most compact and intensely magnetized sources. The most rapid bursts also exhibited the hardest X-ray spectra, as published previously. These facts are important clues to understanding the physical process responsible for impulsive bursts. A model for the bursts is suggested, based on the observations and inferences described.

Subject headings: acceleration of particles — Sun: radio radiation — X-rays: bursts

Type
Poster Papers
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 697 - 700
Copyright
Copyright © The American Astronomical Society 1994

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