Small electron acceleration episodes in the solar corona

James, T., Subramanian, P. and Kontar, E. P. (2017) Small electron acceleration episodes in the solar corona. Monthly Notices of the Royal Astronomical Society, 471(1), pp. 89-99. (doi:10.1093/mnras/stx1460)

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Abstract

We study the energetics of non-thermal electrons produced in small acceleration episodes in the solar corona. We carried out an extensive survey spanning 2004–2015 and shortlisted six impulsive electron events detected at 1 au that were not associated with large solar flares (GOES soft X-ray class > C1) or with coronal mass ejections. Each of these events had weak, but detectable hard X-ray (HXR) emission near the west limb, and were associated with interplanetary type III bursts. In some respects, these events seem like weak counterparts of ‘cold/tenuous’ flares. The energy carried by the HXR producing electron population was ≈1023–1025 erg, while that in the corresponding population detected at 1 au was ≈1024– 1025 erg. The number of electrons that escape the coronal acceleration site and reach 1 au constitute 6 per cent to 148 per cent of those that precipitate downwards to produce thick target HXR emission.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kontar, Dr Eduard
Authors: James, T., Subramanian, P., and Kontar, E. P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Monthly Notices of the Royal Astronomical Society
Publisher:Oxford University Press
ISSN:0035-8711
ISSN (Online):1365-2966
Published Online:12 June 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Monthly Notices of the Royal Astronomical Society 471(1): 89-99
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
631581Consolidated grant in solar and astrophysical plasmasLyndsay FletcherScience & Technology Facilities Council (STFC)ST/L000741/1S&E P&A - PHYSICS & ASTRONOMY