Super-efficient Electron Acceleration by an Isolated Magnetic Reconnection

被引：113

作者：

Fu, H. S. ^{[1
]}

Xu, Y. ^{[1
]}

Vaivads, A. ^{[2
]}

Khotyaintsev, Y. V. ^{[2
]}

机构：

[1] Beihang Univ, Sch Space & Environm, Beijing, Peoples R China

[2] Swedish Inst Space Phys, Uppsala, Sweden

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 870卷 / 02期

关键词：

acceleration of particles; magnetic reconnection; BURSTY BULK FLOWS; DIPOLARIZATION FRONTS; PARTICLE-ACCELERATION; ENERGETIC ELECTRONS; MMS; WAVES;

D O I：

10.3847/2041-8213/aafa75

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Magnetic reconnection-the process typically lasting for a few seconds in space-is able to accelerate electrons. However, the efficiency of the acceleration during such a short period is still a puzzle. Previous analyses, based on spacecraft measurements in the Earth's magnetotail, indicate that magnetic reconnection can enhance electron fluxes up to 100 times. This efficiency is very low, creating an impression that magnetic reconnection is not good at particle acceleration. By analyzing Cluster data, we report here a remarkable magnetic reconnection event during which electron fluxes are enhanced by 10,000 times. Such acceleration, 100 times more efficient than those in previous studies, is caused by the betatron mechanism. Both reconnection fronts and magnetic islands contribute to the acceleration, with the former being more prominent.

引用

页数：7

共 50 条

[31] Energetic electron acceleration in the downstream reconnection outflow region [J].

Imada, S. ;

Nakamura, R. ;

Daly, P. W. ;

Hoshino, M. ;

Baumjohann, W. ;

Muehlbachler, S. ;

Balogh, A. ;

Reme, H. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2007, 112 (A3)

[32] Electron acceleration in the reconnection diffusion region: Cluster observations [J].

Huang, S. Y. ;

Vaivads, A. ;

Khotyaintsev, Y. V. ;

Zhou, M. ;

Fu, H. S. ;

Retino, A. ;

Deng, X. H. ;

Andre, M. ;

Cully, C. M. ;

He, J. S. ;

Sahraoui, F. ;

Yuan, Z. G. ;

Pang, Y. .

GEOPHYSICAL RESEARCH LETTERS, 2012, 39

[33] Magnetic reconnection configurations and particle acceleration in solar flares [J].

Chen, P. F. ;

Liu, W. J. ;

Fang, C. .

ADVANCES IN SPACE RESEARCH, 2007, 39 (09) :1421-1426

[34] EVIDENCE OF ELECTRON ACCELERATION AROUND THE RECONNECTION X- POINT IN A SOLAR FLARE [J].

Narukage, Noriyuki ;

Shimojo, Masumi ;

Sakao, Taro .

ASTROPHYSICAL JOURNAL, 2014, 787 (02)

[35] PARTICLE ACCELERATION BY MAGNETIC RECONNECTION IN A TWISTED CORONAL LOOP [J].

Gordovskyy, Mykola ;

Browning, Philippa K. .

ASTROPHYSICAL JOURNAL, 2011, 729 (02)

[36] Physics of the saturation of particle acceleration in relativistic magnetic reconnection [J].

Kagan, Daniel ;

Nakar, Ehud ;

Piran, Tsvi .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 476 (03) :3902-3912

[37] FAST MAGNETIC RECONNECTION AND PARTICLE ACCELERATION IN RELATIVISTIC LOW-DENSITY ELECTRON-POSITRON PLASMAS WITHOUT GUIDE FIELD [J].

Bessho, Naoki ;

Bhattacharjee, A. .

ASTROPHYSICAL JOURNAL, 2012, 750 (02)

[38] Preliminary Results on Favorable Conditions for Electron Heating and Acceleration during Magnetic Reconnection [J].

Nurumira, A. W. ;

Teh, W. -L. ;

Abdullah, M. .

2019 6TH INTERNATIONAL CONFERENCE ON SPACE SCIENCE AND COMMUNICATION (ICONSPACE2019), 2019, :108-111

[39] Electron dynamics in collisionless magnetic reconnection [J].

Lu QuanMing ;

Wang RongSheng ;

Xie JinLin ;

Huang Can ;

Lu San ;

Wang Shui .

CHINESE SCIENCE BULLETIN, 2011, 56 (12) :1174-1181

[40] Acceleration of cold ions in magnetic reconnection [J].

Zhang, Heng ;

Lei, Bing-Yan ;

Zhu, Zhi-Lin ;

Zhang, Qing-He .

PHYSICS OF PLASMAS, 2022, 29 (11)

← 1 2 3 4 5 →