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Decimetric type III radio bursts and associated hard X-ray spikesFor a relatively weak solar flare on August 6, 1981, at 10:32 UT, a detailed comparison is made between hard X-ray spikes and decimetric type III radio bursts. The hard X-ray observations are made at energies above 30 keV, and the radio data are obtained in the frequency range from 100 to 1000 MHz. The time resolution for all the data sets is approximately 0.1 s or better. The dynamic radio spectrum exhibits many fast drift type III radio bursts with both normal and reverse slope, whereas the X-ray time profile contains many well resolved short spikes with durations less than or equal to 1 s. Some of the X-ray spikes are seen to be associated in time with reverse-slope bursts, indicating either that the electron beams producing the radio burst contain two or three orders of magnitude more fast electrons than has previously been assumed or that the electron beams can induce the acceleration of additional electrons or occur in coincidence with this acceleration. A case is presented in which a normal slope radio burst at approximately 600 MHz occurs in coincidence with the peak of an X-ray spike to within 0.1 s.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Dennis, B. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Benz, A. O. (Zuerich Eidgenoessische Technische Hochschule, Zurich, Switzerland)
Ranieri, M. (CNR Istituto di Astrofisica Spaziale, Frascati, Italy)
Simnett, G. M. (Birmingham, University Birmingham, United Kingdom)
Date Acquired
August 12, 2013
Publication Date
February 1, 1984
Publication Information
Publication: Solar Physics
Volume: 90
ISSN: 0038-0938
Subject Category
Funding Number(s)
Distribution Limits