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dc.contributor.authorEradat Oskoui, S.
dc.contributor.authorNeukirch, T.
dc.date.accessioned2015-10-05T15:40:00Z
dc.date.available2015-10-05T15:40:00Z
dc.date.issued2014-07
dc.identifier221455297
dc.identifierdc759b21-a4e8-423d-a87a-0642a25002b3
dc.identifier000341185300126
dc.identifier84905041583
dc.identifier000341185300126
dc.identifier.citationEradat Oskoui , S & Neukirch , T 2014 , ' Particle energisation in a collapsing magnetic trap model : the relativistic regime ' , Astronomy & Astrophysics , vol. 567 , A131 . https://doi.org/10.1051/0004-6361/201423886en
dc.identifier.issn0004-6361
dc.identifier.otherORCID: /0000-0002-7597-4980/work/34032285
dc.identifier.urihttps://hdl.handle.net/10023/7603
dc.descriptionThe authors acknowledge financial support by the UK’s Science and Technology Facilities Council through a Doctoral Training Grant (SEO) and Consolidated Grant ST/K000950/1 (SEO and TN).en
dc.description.abstractContext. In solar flares, a large number of charged particles is accelerated to high energies. By which physical processes this is achieved is one of the main open problems in solar physics. It has been suggested that during a flare, regions of the rapidly relaxing magnetic field can form a collapsing magnetic trap (CMT) and that this trap may contribute to particle energisation. Aims. In this Research Note we focus on a particular analytical CMT model based on kinematic magnetohydrodynamics. Previous investigations of particle acceleration for this CMT model focused on the non-relativistic energy regime. It is the specific aim of this Research Note to extend the previous work to relativistic particle energies. Methods. Particle orbits were calculated numerically using the relativistic guiding centre equations. We also calculated particle orbits using the non-relativistic guiding centre equations for comparison. Results. For mildly relativistic energies the relativistic and non-relativistic particle orbits mainly agree well, but clear deviations are seen for higher energies. In particular, the final particle energies obtained from the relativistic calculations are systematically lower than the energies reached from the corresponding non-relativistic calculations, and the mirror points of the relativistic orbits are systematically higher than for the corresponding non-relativistic orbits. Conclusions. While the overall behaviour of particle orbits in CMTs does not differ qualitatively when using the relativistic guiding centre equations, there are a few systematic quantitative differences between relativistic and non-relativistic particle dynamics.
dc.format.extent4
dc.format.extent1614588
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysicsen
dc.subjectSun: coronaen
dc.subjectSun: activityen
dc.subjectSun: flaresen
dc.subjectAcceleration of particlesen
dc.subjectQB Astronomyen
dc.subjectQA Mathematicsen
dc.subjectQC Physicsen
dc.subject.lccQBen
dc.subject.lccQAen
dc.subject.lccQCen
dc.titleParticle energisation in a collapsing magnetic trap model : the relativistic regimeen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. Applied Mathematicsen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.identifier.doi10.1051/0004-6361/201423886
dc.description.statusPeer revieweden
dc.identifier.grantnumberST/K000950/1en


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