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Electric fields in the solar atmosphere - A reviewA review is presented of remote sensing techniques which measure the electric field component transverse to the line of sight and achieve a sensitivity range of 5-10 V/cm. Three models are shown to predict quasistatic, macroscopic values of E(parallel), the electric field component parallel to the magnetic vector, beyond the sensitivity range considered. These processes are: the discharge model of flares; the models of return currents related to flare particle beams; and the models of neutral sheets related to two-ribbon flares and postflare loops. Time dependent electric fields related to MHD and plasma waves, and to plasma disturbance, may allow the detection of both E components (parallel and perpendicular). The uncertainty relating to the emission measures, time scales, volumes, and plasma conditions of these flares and electrified plasma volumes is emphasized. It is pointed out, however, that important information can be obtained by observing electric fields at existing sensitivity levels. By measuring these E-fields, the understanding of flares and related dynamic events can be improved.
Document ID
19910051722
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Foukal, P.
(Cambridge Research and Instrumentation, Inc. MA, United States)
Hinata, S.
(Auburn University AL, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Solar Physics
Volume: 132
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
91A36345
Funding Number(s)
CONTRACT_GRANT: NASW-4538
CONTRACT_GRANT: F19628-87-C-0110
Distribution Limits
Public
Copyright
Other

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