Particle acceleration and transport in reconnecting twisted loops in a stratified atmosphere
Particle acceleration and transport in reconnecting twisted loops in a stratified atmosphere
复制标题
分层大气中重新连接扭曲环路时的粒子加速和传输
DOI:
10.1051/0004-6361/201321715
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发表时间:
2014
影响因子:
6.5
通讯作者:
Gordovskyy M
中科院分区:
文献类型:
--
作者:
Gordovskyy M
ContextTwisted coronal loops should be ubiquitous in the solar corona. Twisted magnetic fields contain excess magnetic energy, which can be released during magnetic reconnection, causing solar flares.AimsThe aim of this work is to investigate magnetic reconnection, and particle acceleration and transport in kink-unstable twisted coronal loops, with a focus on the effects of resistivity, loop geometry and atmospheric stratification. Another aim is to perform forward-modelling of bremsstrahlung emission and determine the structure of hard X-ray sources.MethodsWe use a combination of magnetohydrodynamic (MHD) and test-particle methods. First, the evolution of the kinking coronal loop is considered using resistive MHD model, incorporating atmospheric stratification and loop curvature. Then, the obtained electric and magnetic fields and density distributions are used to calculate electron and proton trajectories using a guiding-centre approximation, taking into account Coulomb collisions.ResultsIt is shown that electric fields in twisted coronal loops can effectively accelerate protons and electrons to energies up to 10 MeV. High-energy particles have hard, nearly power-law energy spectra. The volume occupied by high-energy particles demonstrates radial expansion, which results in the expansion of the visible hard X-ray loop and a gradual increase in hard X-ray footpoint area. Synthesised hard X-ray emission reveals strong footpoint sources and the extended coronal source, whose intensity strongly depends on the coronal loop density.
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影响因子:
2.6
作者:
M. Gordovskyy;V. Zharkova;Y. Voitenko;M. Goossens
通讯作者:
M. Gordovskyy;V. Zharkova;Y. Voitenko;M. Goossens
DOI:
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发表时间:
1996
期刊:
影响因子:
--
作者:
T. N. Larosa;R. Moore;James A. Miller;S. Shore
通讯作者:
S. Shore
影响因子:
6.5
作者:
V. Zharkova;M. Gordovskyy
通讯作者:
M. Gordovskyy
DOI:
10.1088/0004-637x/720/2/1603
发表时间:
2010-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Gordovskyy;P. K. Browning;G. Vekstein
通讯作者:
M. Gordovskyy;P. K. Browning;G. Vekstein
影响因子:
6.5
作者:
V. Archontis;K. Tsinganos;C. Gontikakis
通讯作者:
V. Archontis;K. Tsinganos;C. Gontikakis