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Particle acceleration in collapsing magnetic traps with a braking plasma jet

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Date
2016
Author
Borissov, Alexei
Neukirch, Thomas
Threlfall, James William
Keywords
Flares, energetic particles
Energetic particles, electrons
Magnetic reconnection, models
QB Astronomy
QC Physics
NDAS
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Abstract
Collapsing magnetic traps (CMTs) are one proposed mechanism for generating non-thermal particle populations in solar flares. CMTs occur if an initially stretched magnetic field structure relaxes rapidly into a lower-energy configuration, which is believed to happen as a by-product of magnetic reconnection. A similar mechanism for energising particles has also been found to operate in the Earth's magnetotail. One particular feature proposed to be of importance for particle acceleration in the magnetotail is that of a braking plasma jet, i.e. a localised region of strong flow encountering stronger magnetic field which causes the jet to slow down and stop. Such a feature has not been included in previously proposed analytical models of CMTs for solar flares. In this work we incorporate a braking plasma jet into a well studied CMT model for the first time. We present results of test particle calculations in this new CMT model. We observe and characterise new types of particle behaviour caused by the magnetic structure of the jet braking region, which allows electrons to be trapped both in the braking jet region and the loop legs. We compare and contrast the behaviour of particle orbits for various parameter regimes of the underlying trap by examining particle trajectories, energy gains and the frequency with which different types of particle orbit are found for each parameter regime.
Citation
Borissov , A , Neukirch , T & Threlfall , J W 2016 , ' Particle acceleration in collapsing magnetic traps with a braking plasma jet ' , Solar Physics , vol. 291 , no. 5 , pp. 1385-1404 . https://doi.org/10.1007/s11207-016-0915-0
Publication
Solar Physics
Status
Peer reviewed
DOI
https://doi.org/10.1007/s11207-016-0915-0
ISSN
0038-0938
Type
Journal article
Rights
© 2016, Springer Science+Business Media Dordrecht. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at link.springer.com / https://dx.doi.org/10.1007/s11207-016-0915-0
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10896

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