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Title:
Characteristics of energetic solar flare electron spectra
Authors:
Moses, Dan; Droege, Wolfgang; Meyer, Peter; Evenson, Paul
Affiliation:
AA(American Science and Engineering, Inc., Cambridge, MA), AB(Chicago, University, IL), AC(Chicago, University, IL), AD(Bartol Research Institute, Newark, DE)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 523-530. (ApJ Homepage)
Publication Date:
11/1989
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Electronic Spectra, Energy Spectra, Solar Flares, International Sun Earth Explorer 3, Interplanetary Medium, Satellite-Borne Instruments, Solar Cosmic Rays, Solar X-Rays
DOI:
10.1086/168034
Bibliographic Code:
1989ApJ...346..523M

Abstract

A 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).

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