Impact of Magnetic Focusing on the Transport of Energetic Electrons in the Solar Corona
Impact of Magnetic Focusing on the Transport of Energetic Electrons in the Solar Corona
复制标题
磁聚焦对日冕中高能电子传输的影响
DOI:
10.1088/1742-6596/2544/1/012004
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Zank, Gary P.
中科院分区:
文献类型:
--
作者:
Tang, Bofeng;Che, Haihong;Zank, Gary P.
Observations of Type III radio bursts discovered that electron beams with power-law energy spectra are commonly produced during solar flares. The locations of these electron beams are~ 300 Mm above the particle acceleration region of the photosphere, and the velocities range from 3 to 10 times the local background electron thermal velocity. However, the mechanism that can commonly produce electron beams during the propagation of energetic electrons with power-law energy spectra in the corona remains unclear. In this paper, using kinetic transport theory, we find for the first time that the magnetic focusing effect governs the formation of electron beams over the observational desired distance in the corona. The magnetic focusing effect can sharply increase the bulk velocity of energetic electrons to the observed electron beam velocity within 0.4 solar radii (300 Mm) as they escape from the acceleration region and propagate upward along magnetic field lines. In more rapidly decreasing magnetic fields, energetic electrons with a harder power-law energy spectrum can generate a higher bulk velocity, producing type III radio bursts at a location much closer to the acceleration region. During propagation, the spectral index of the energetic electrons is unchanged.
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DOI:
10.3847/1538-4357/ab7a93
发表时间:
2020-04
期刊:
The Astrophysical Journal
影响因子:
--
作者:
B. Tang;G. Zank;V. Kolobov
通讯作者:
B. Tang;G. Zank;V. Kolobov
影响因子:
10.3
作者:
V. Zharkova;K. Arzner;A. Benz;P. Browning;C. Dauphin;A. Emslie;L. Fletcher;E. P. Kontar;
通讯作者:
V. Zharkova;K. Arzner;A. Benz;P. Browning;C. Dauphin;A. Emslie;L. Fletcher;E. P. Kontar;
影响因子:
4.9
作者:
Che, H.;Zank, G. P.;Crawford, C.
通讯作者:
Crawford, C.
影响因子:
4.9
作者:
Che, H.;Zank, G. P.
通讯作者:
Zank, G. P.
影响因子:
4.9
作者:
H. Che;M. Goldstein;C. Salem;A. Viñas
通讯作者:
A. Viñas