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Numerical simulation of superhalo electrons generated by magnetic reconnection in the solar wind source region
Yang, Li-Ping; Wang, Ling-Hua; He, Jian-Sen; Tu, Chuan-Yi; Zhang, Shao-Hua; Zhang, Lei; Feng, Xue-Shang; Yang, LP (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Department空间科学部
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2015
Volume15Issue:3Pages:348-362
ISSN1674-4527
Language英语
KeywordAcceleration Of Particles Methods: Numerical Sun: Particle Emission (Sun:) Solar Wind Sun: Transition Region
AbstractSuperhalo electrons appear to be continuously present in the interplanetary medium, even during very quiet times, with a power-law spectrum at energies above similar to 2 keV. Here we numerically investigate the generation of superhalo electrons by magnetic reconnection in the solar wind source region, using magnetohydrodynamics and test particle simulations for both single X-line reconnection and multiple X-line reconnection. We find that the direct current electric field, produced in the magnetic reconnection region, can accelerate electrons from an initial thermal energy of T similar to 10(5) K up to hundreds of keV. After acceleration, some of the accelerated electrons, together with the nascent solar wind flow driven by the reconnection, propagate upwards along the newly-opened magnetic field lines into interplanetary space, while the rest move downwards into the lower atmosphere. Similar to the observed superhalo electrons at 1 AU, the flux of upward-traveling accelerated electrons versus energy displays a power-law distribution at similar to 2 - 100 keV, f (E) similar to E-delta, with a delta of similar to 1.5 - 2.4. For single (multiple) X-line reconnection, the spectrum becomes harder (softer) as the anomalous resistivity parameter alpha (uniform resistivity eta) increases. These modeling results suggest that the acceleration in the solar wind source region may contribute to superhalo electrons.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4647
Collection空间科学部
Corresponding AuthorYang, LP (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Recommended Citation
GB/T 7714
Yang, Li-Ping,Wang, Ling-Hua,He, Jian-Sen,et al. Numerical simulation of superhalo electrons generated by magnetic reconnection in the solar wind source region[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(3):348-362.
APA Yang, Li-Ping.,Wang, Ling-Hua.,He, Jian-Sen.,Tu, Chuan-Yi.,Zhang, Shao-Hua.,...&Yang, LP .(2015).Numerical simulation of superhalo electrons generated by magnetic reconnection in the solar wind source region.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(3),348-362.
MLA Yang, Li-Ping,et al."Numerical simulation of superhalo electrons generated by magnetic reconnection in the solar wind source region".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.3(2015):348-362.
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