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The coevolution of decimetric millisecond spikes and hard X-ray emission during solar flaresResults are presented of an analysis of a comprehensive data set of 27 solar flares with decimetric millisecond spikes between 1980 and 1989, simultaneously observed with the Zuerich radio spectrometers and the Hard X-ray Burst Spectrometer on the SMM spacecraft. Two contradictory relationships of the coevolution of hard X-ray and spiky radio emissions during flares are found: the temporal evolution of both emissions reveals a close functional dependence, but there is a substantial time delay between the two emissions. Five possible scenarios for the hard-X-ray-associated radio spike emission which may account for both their detailed coevolution and their substantial intervening time delay are discussed. All five scenarios are able to explain both the close coevolution of hard X-ray and radio emission as well as their mutual delay to some degree, but none of them can explain all observational aspects in a simple way.
Document ID
19930037505
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Aschwanden, Markus J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Guedel, Manuel
(Swiss Federal Inst. of Technology Zurich, Switzerland)
Date Acquired
August 16, 2013
Publication Date
December 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 401
Issue: 2
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A21502
Funding Number(s)
CONTRACT_GRANT: SNSF-2000-5,499
CONTRACT_GRANT: NAS5-30442
Distribution Limits
Public
Copyright
Other

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