Weibel instability and structures of magnetic island in anti-parallel collisionless magnetic reconnection

2011 ◽  
Vol 18 (7) ◽  
pp. 072105 ◽  
Author(s):  
San Lu ◽  
Quanming Lu ◽  
Xi Shao ◽  
Peter H. Yoon ◽  
Shui Wang
Keyword(s):  
Magnetic Reconnection ◽  
Magnetic Island ◽  
Weibel Instability

scholarly journals Modeling of magnetic island formation in magnetic reconnection experiment

1999 ◽  
Vol 6 (4) ◽  
pp. 1253-1257 ◽  
Author(s):  
T.-H. Watanabe ◽  
T. Hayashi ◽  
T. Sato ◽  
M. Yamada ◽  
H. Ji
Keyword(s):  
Magnetic Reconnection ◽  
Magnetic Island ◽  
Island Formation

Effect of plasma-β on the onset of plasmoid instability in Sweet–Parker current sheets

2014 ◽  
Vol 80 (5) ◽  
pp. 655-665 ◽  
Author(s):  
H. Baty
Keyword(s):  
Magnetic Reconnection ◽  
Temperature Increase ◽  
Numerical Study ◽  
Two Dimensional ◽  
Magnetic Island ◽  
Current Sheets ◽  
A Value ◽  
Similar Dependence ◽  
Definition Of ◽  
Local Temperature Increase

AbstractA numerical study of magnetic reconnection in two-dimensional resistive magnetohydrodynamics for Sweet–Parker current sheets that are subject to plasmoid instability is carried out. The effect of the initial upstream plasma-β on the critical Lundquist number Sc for the onset of plasmoid instability is studied. Our results indicate a weak dependence, with a value of Sc ≃ 1.5 × 104 in the limit of zero β, and a value of Sc ≃ 1 × 104 in the opposite high β regime (β ≫ 1). A similar dependence was previously obtained (Ni et al. 2012 Phys. Plasm. 19, 072902), but with a somewhat much larger variation, that can be largely attributed to the different configuration setup used in their study, and also to the definition of the Lundquist number. This conclusion does not depend significantly on the equilibrium used, i.e. both initial configurations with either plasma density or temperature spatial variations lead to very similar results. Finally, we show that the inner plasmoid structure appears as an under-dense hotted magnetic island, with a local temperature increase that is noticeably strengthened for low β cases.

scholarly journals Magnetic island dynamics in magnetic reconnection in UTST experiments

2018 ◽  
Vol 25 (1) ◽  
pp. 012126 ◽  
Author(s):  
S. Kamio ◽  
M. Inomoto ◽  
K. Yamasaki ◽  
T. Yamada ◽  
C. Z. Cheng ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Magnetic Island ◽  
Island Dynamics

scholarly journals Evidence of transient reconnection in the outflow jet of primary reconnection site

2014 ◽  
Vol 32 (3) ◽  
pp. 239-248 ◽  
Author(s):  
R. Wang ◽  
R. Nakamura ◽  
T. Zhang ◽  
A. Du ◽  
W. Baumjohann ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Magnetic Reconnection ◽  
Observational Evidence ◽  
Generation Mechanism ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Subsequent Evolution ◽  
Reconnection Site

Abstract. The precise mechanism for the formation of magnetic islands in the magnetotail and the subsequent evolution are still controversial. New investigations have provided the first observational evidence of secondary reconnection in the earthward outflow jet of primary reconnection in the magnetotail. The secondary reconnection takes place 38 c/ωpi earthward from the primary reconnection site and results in the birth of a magnetic island observed. This generation mechanism is different from the widely used model of multiple reconnection X-lines. The duration of the secondary reconnection was approximate one ion gyration period (5 s). The observations resemble recent numerical simulations where magnetic reconnection could spontaneously and transiently happen in the outflow jet, called secondary reconnection, which was used to explain the formation of the dipolarization fronts. Coincidentally, another magnetic island moving earthward passed through three satellites successively. By this chance we find the magnetic island was accelerated towards Earth with an acceleration of about 9 km s−2 at −19 RE in the magnetotail.

scholarly journals Comparisons of electron acceleration efficiency among different structures during magnetic reconnection: a Cluster multicase study

2015 ◽  
Vol 33 (12) ◽  
pp. 1469-1478 ◽  
Author(s):  
M. Zhou ◽  
T. Li ◽  
X. Deng ◽  
S. Huang ◽  
H. Li
Keyword(s):  
Magnetic Reconnection ◽  
Current Sheet ◽  
Flux Ratio ◽  
Electron Acceleration ◽  
Maximum Efficiency ◽  
Magnetic Island ◽  
Specific Sequence ◽  
Energetic Electrons ◽  
Thin Current Sheet ◽  
Magnetotail Reconnection

Abstract. Magnetic reconnection has long been believed to be an efficient engine for energetic electrons production. Four different structures have been proposed for electrons being energized: flux pileup region, density cavity located around the separatrix, magnetic island and thin current sheet. In this paper, we compare the electron acceleration efficiency among these structures based on 12 magnetotail reconnection events observed by the Cluster spacecraft in 2001–2006. We used the flux ratio between the energetic electrons (> 50 keV) and lower energy electrons (< 26 keV) to quantify the electron acceleration efficiency. We do not find any specific sequence in which electrons are accelerated within these structures, though the flux pileup region, magnetic island and thin current sheet have higher probabilities to reach the maximum efficiency among the four structures than the density cavity. However, the most efficient electron energization usually occurs outside these structures. We suggest that other structures may also play important roles in energizing electrons. Our results could provide important constraints for the further modeling of electron acceleration during magnetic reconnection.

Development of Turbulent Magnetic Reconnection in a Magnetic Island

2017 ◽  
Vol 835 (2) ◽  
pp. 245 ◽  
Author(s):  
Can Huang ◽  
Quanming Lu ◽  
Rongsheng Wang ◽  
Fan Guo ◽  
Mingyu Wu ◽  
...  
Keyword(s):  
Magnetic Reconnection ◽  
Magnetic Island

Electron acceleration in a secondary magnetic island formed during magnetic reconnection with a guide field

2017 ◽  
Vol 24 (5) ◽  
pp. 052113 ◽  
Author(s):  
Huanyu Wang ◽  
Quanming Lu ◽  
Can Huang ◽  
Shui Wang
Keyword(s):  
Magnetic Reconnection ◽  
Electron Acceleration ◽  
Magnetic Island ◽  
Guide Field
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