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The development of X-ray flare onsets near active region filamentsSkylab X-ray images of the early phases of six active region transient brightenings were compared with simultaneous H-alpha images to study the spatial relationships between filaments and the X-ray brightenings. When the X-ray loops were roughly perpendicular to the axes of the H-alpha filaments, the filaments did not disappear. X-ray loops which appeared nearly parallel to the filaments were generally associated with the disappearances of those filaments. It is suggested that the perpendicular loops correspond to the class I X-ray flares of Pallavicinic et al. (1977) while the parallel loops are the early phases of their class II flares characterized in the decay phases by arcades of large loops with low energy densities. Both kinds of X-ray flares can be associated with impulsive phases.
Document ID
19810055440
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kahler, S. W.
(American Science and Engineering, Inc. Arlington, MA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1981
Publication Information
Publication: Solar Physics
Volume: 71
Subject Category
Solar Physics
Accession Number
81A39844
Funding Number(s)
CONTRACT_GRANT: NAS8-27758
Distribution Limits
Public
Copyright
Other

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