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On the energization of charged particles by fast magnetic reconnection
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 470, no 1, 723-731 p., stx1291Article in journal (Refereed) Published
Abstract [en]

We study the role of turbulence in magnetic reconnection, within the framework of magnetohydrodynamics, using three-dimensional direct numerical simulations. For small turbulent intensity, we find that the reconnection rate obeys Sweet-Parker scaling. For large enough turbulent intensity, reconnection rate departs significantly from Sweet-Parker behaviour, becomes almost a constant as a function of the Lundquist number.We further study energization of test-particles in the same set-up. We find that the speed of the energized particles obeys a Maxwellian distribution, whose variance also obeys Sweet-Parker scaling for small turbulent intensity but depends weakly on the Lundquist number for large turbulent intensity. Furthermore, the variance is found to increase with the strength of the reconnecting magnetic field.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 470, no 1, 723-731 p., stx1291
Keyword [en]
Acceleration of particles, Magnetic reconnection, MHD, Plasma
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-212233DOI: 10.1093/mnras/stx1291ISI: 000406842600044Scopus ID: 2-s2.0-85021816892OAI: oai:DiVA.org:kth-212233DiVA: diva2:1134645
Funder
Swedish Research Council, 638-2013-9243
Note

QC 20170821

Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2017-08-25Bibliographically approved

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Mitra, Dhrubaditya
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  • nn-NB
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  • Other locale
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