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Coronal jets, magnetic topologies, and the production of interplanetary electron streams

Li, C; Matthews, SA; Van Driel-Gesztelyi, L; Sun, J; Owen, CJ; (2011) Coronal jets, magnetic topologies, and the production of interplanetary electron streams. The Astrophysical Journal , 735 (1) 10.1088/0004-637X/735/1/43. Green open access

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Abstract

We investigate the acceleration source of the impulsive solar energetic particle (SEP) events on 2007 January 24. Combining the in situ electron measurements and remote-sensing solar observations, as well as the calculated magnetic fields obtained from a potential-field source-surface model, we demonstrate that the jets associated with the hard X-ray flares and type-III radio bursts, rather than the slow and partial coronal mass ejections, are closely related to the production of interplanetary electron streams. The jets, originated from the well-connected active region (AR 10939) whose magnetic polarity structure favors the eruption, are observed to be forming in a coronal site, extending to a few solar radii, and having a good temporal correlation with the electron solar release. The open-field lines near the jet site are rooted in a negative polarity, along which energetic particles escape from the flaring AR to the near-Earth space, consistent with the in situ electron pitch angle distribution. The analysis enables us to propose a coronal magnetic topology relating the impulsive SEP events to their solar source.

Type: Article
Title: Coronal jets, magnetic topologies, and the production of interplanetary electron streams
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0004-637X/735/1/43
Publisher version: http://dx.doi.org/10.1088/0004-637X/735/1/43
Language: English
Additional information: Copyright © 2011 The American Astronomical Society. All rights reserved.
Keywords: Sun: flares, Sun: magnetic topology, Sun: particle emission
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1304952
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