Effect of Collisions and Magnetic Convergence on Electron Acceleration and Transport in Reconnecting Twisted Solar Flare Loops

被引：35
作者：
Gordovskyy, M. [1 ]
Browning, P. K. [1 ]
Kontar, E. P. [2 ]
Bian, N. H. [2 ]
机构：
[1] Univ Manchester, Ctr Astrophys, Jodrell Bank, Manchester M13 9PL, Lancs, England
[2] Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
来源：
SOLAR PHYSICS | 2013年 / 284卷 / 02期
基金：
英国科学技术设施理事会;
关键词：
Flares; energetic particles; Magnetic reconnection; theory; Energetic particles; acceleration; PARTICLE-ACCELERATION; ENERGETIC ELECTRONS; MODEL;
D O I：
10.1007/s11207-012-0124-4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study a model of particle acceleration coupled with an MHD model of magnetic reconnection in unstable twisted coronal loops. The kink instability leads to the formation of helical currents with strong parallel electric fields resulting in electron acceleration. The motion of electrons in the electric and magnetic fields of the reconnecting loop is investigated using a test-particle approach taking into account collisional scattering. We discuss the effects of Coulomb collisions and magnetic convergence near loop footpoints on the spatial distribution and energy spectra of high-energy electron populations and possible implications on the hard X-ray emission in solar flares.
引用
收藏
页码：489 / 498
页数：10
相关论文
共 27 条
  • [1] A staggered grid, Lagrangian-Eulerian remap code for 3-D MHD simulations
    Arber, TD
    Longbottom, AW
    Gerrard, CL
    Milne, AM
    [J]. JOURNAL OF COMPUTATIONAL PHYSICS, 2001, 171 (01) : 151 - 181
  • [2] Solar Flare and CME Observations with STEREO/EUVI
    Aschwanden, M. J.
    Wuelser, J. P.
    Nitta, N. V.
    Lemen, J. R.
    [J]. SOLAR PHYSICS, 2009, 256 (1-2) : 3 - 40
  • [3] HARD X-RAY FOOTPOINT SIZES AND POSITIONS AS DIAGNOSTICS OF FLARE ACCELERATED ENERGETIC ELECTRONS IN THE LOW SOLAR ATMOSPHERE
    Battaglia, M.
    Kontar, E. P.
    [J]. ASTROPHYSICAL JOURNAL, 2011, 735 (01)
  • [4] A THERMAL/NONTHERMAL MODEL FOR SOLAR HARD X-RAY-BURSTS
    BENKA, SG
    HOLMAN, GD
    [J]. ASTROPHYSICAL JOURNAL, 1994, 435 (01) : 469 - 481
  • [5] Bian NH, 2008, ASTROPHYS J LETT, V687, pL111, DOI 10.1086/593145
  • [6] Observations of rotating sunspots from TRACE
    Brown, DS
    Nightingale, RW
    Alexander, D
    Schrijver, CJ
    Metcalf, TR
    Shine, RA
    Title, AM
    Wolfson, CJ
    [J]. SOLAR PHYSICS, 2003, 216 (1-2) : 79 - 108
  • [7] Local re-acceleration and a modified thick target model of solar flare electrons
    Brown, J. C.
    Turkmani, R.
    Kontar, E. P.
    MacKinnon, A. L.
    Vlahos, L.
    [J]. ASTRONOMY & ASTROPHYSICS, 2009, 508 (02): : 993 - 1000
  • [8] DEDUCTION OF ENERGY SPECTRA OF NON-THERMAL ELECTRONS IN FLARES FROM OBSERVED DYNAMIC SPECTRA OF HARD X-RAY BURSTS
    BROWN, JC
    [J]. SOLAR PHYSICS, 1971, 18 (03) : 489 - &
  • [9] Heating the corona by nanoflares: simulations of energy release triggered by a kink instability
    Browning, P. K.
    Gerrard, C.
    Hood, A. W.
    Kevis, R.
    Van der Linden, R. A. M.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 485 (03) : 837 - 848
  • [10] Flare particle acceleration and magnetohydrodynamic instabilities
    Browning, P. K.
    Gordovskyy, M.
    Stanier, A.
    Hood, A. W.
    Dalla, S.
    [J]. PLASMA PHYSICS AND CONTROLLED FUSION, 2011, 53 (12)
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