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Characteristics of energetic solar flare electron spectraA 55 event survey of energy spectra of 0.1-100 MeV interplanetary electrons originating from solar flares as measured by two spectrometers onboard the ISEE 3 (ICE) spacecraft for the years 1978-1982 has been completed. Spectra generated using the maximum flux of a given event in each energy channel were restricted to events with a well-defined flux rise time. Two broad groups of electron spectra are considered. In one group, the spectra are well represented by a single power law in rigidity with spectral index in the range 3-4.5. The spectra in the other group deviate from a power law in rigidity systematically in that they harden with increasing rigidity. Events with near power-law spectra are found to be correlated with long-duration soft X-ray events, whereas those with hardening spectra are correlated with short-duration events. The possible variation of acceleration and propagation processes with the properties of the flare site is discussed, using the duration of the soft X-ray flare emission as an indicator of the physical parameters of the flare site (flare volume, density, coronal height, and magnetic field geometry).
Document ID
19900026023
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Moses, Dan
(American Science and Engineering, Inc. Cambridge, MA, United States)
Droege, Wolfgang
(American Science and Engineering, Inc. Cambridge, MA, United States)
Meyer, Peter
(Chicago, University IL, United States)
Evenson, Paul
(Bartol Research Institute Newark, DE, United States)
Date Acquired
August 14, 2013
Publication Date
November 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 346
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
90A13078
Funding Number(s)
CONTRACT_GRANT: NAG5-374
CONTRACT_GRANT: NAS5-25496
CONTRACT_GRANT: NAS5-28500
Distribution Limits
Public
Copyright
Other

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