scholarly journals Strongly localized magnetic reconnection by the super-Alfvénic shear flow

2018 ◽  
Vol 25 (8) ◽  
pp. 080701 ◽  
Author(s):  
Yi-Hsin Liu ◽  
M. Hesse ◽  
F. Guo ◽  
H. Li ◽  
T. K. M. Nakamura
Keyword(s):  
Shear Flow ◽  
Magnetic Reconnection

scholarly journals Slow shock formation and structure with sub-Alfvénic shear flow in magnetic reconnection

2012 ◽  
Vol 117 (A6) ◽  
pp. n/a-n/a ◽  
Author(s):  
L. J. Li ◽  
X. Zhang ◽  
L. C. Wang ◽  
Z. W. Ma
Keyword(s):  
Shear Flow ◽  
Magnetic Reconnection ◽  
Shock Formation ◽  
Slow Shock

Magnetic reconnection induced by the Kelvin-Helmholtz vortex at the Earth’s magnetopause during southward IMF

2020 ◽  
Author(s):  
Takuma Nakamura ◽  
Ferdinand Plaschke ◽  
Hiroshi Hasegawa ◽  
Yi-Hsin Liu ◽  
Kyoung-Joo Hwang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shear Flow ◽  
Magnetic Reconnection ◽  
Linear Growth ◽  
Low Latitude ◽  
The Earth ◽  
Non Linear ◽  
The Difference ◽  
Field Lines ◽  
The Magnetic Field

<p>When the magnetic field is oriented nearly perpendicular to the direction of the plasma shear flow, the flow easily satisfies the super-Alfvénic unstable condition for the Kelvin-Helmholtz (KH) instability. This configuration is realized at the Earth’s low-latitude magnetopause when the interplanetary magnetic field (IMF) is strongly northward or southward. Indeed, clear signatures of the KH waves have been frequently observed during periods of the northward IMF. However, these signatures have been much less frequently observed during the southward IMF. In this work, we performed the first 3-D fully kinetic simulation of the KH instability at the magnetopause under the southward IMF condition. The simulation demonstrates that magnetic reconnection, with a typical fast rate on the order of 0.1, is induced at multiple locations along the vortex edge in an early non-linear growth phase of the KH instability. The reconnection outflow jet, which grows in the direction nearly perpendicular to the initial shear flow, significantly disrupt the flow of the non-linear KH vortex. On the other hand, the shear and vortex flow strongly bends and twists the reconnected field lines towards the direction out of the reconnection plane. The resulting coupling of the complex field and flow patterns within the magnetopause boundary layer leads to a quick decay of the vortex structure. These simulation results suggest that clear signatures of the KH waves are expected to be observed only for a limited phase during periods of the southward IMF, which may explain the difference in the observation probability of KH waves between northward and southward IMFs.</p>

The influence of out-of-plane shear flow on Hall magnetic reconnection and FTE generation

2013 ◽  
Vol 118 (7) ◽  
pp. 4279-4288 ◽  
Author(s):  
Yangao Chen ◽  
Chijie Xiao ◽  
Xiaogang Wang ◽  
Jiaqi Wang ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Shear Flow ◽  
Magnetic Reconnection ◽  
Plane Shear ◽  
Out Of Plane

scholarly journals Scaling of the magnetic reconnection rate with symmetric shear flow

2011 ◽  
Vol 18 (7) ◽  
pp. 074501 ◽  
Author(s):  
P. A. Cassak ◽  
A. Otto
Keyword(s):  
Shear Flow ◽  
Magnetic Reconnection ◽  
Reconnection Rate

Particle-In-Cell simulations of magnetic reconnection in the presence of a cold shear flow

2020 ◽  
Author(s):  
Susanne Flø Spinnangr ◽  
Paul Tenfjord ◽  
Michael Hesse ◽  
Cecilia Norgren ◽  
Norah Kwagala
Keyword(s):  
Shear Flow ◽  
Magnetic Reconnection ◽  
Current Sheet ◽  
Shear Flows ◽  
Kinetic Studies ◽  
Ion Flow ◽  
Particle In Cell ◽  
Reconnection Process ◽  
Cell Simulation ◽  
Asymmetric Flows

<p>Our group has done extensive research on the fluid and kinetic effect of cold ion populations on the reconnection process, in an effort to identify factors that can lead to the onset or stopping of magnetic reconnection. Recent fully kinetic studies involving cold protons or oxygen have shown that flows of cold particles significantly modify the reconnection process, and that the nature of this modification is dependent on the configuration of these flows and the constituent ions of the flows. In this study we want to investigate how the reconnection process is affected by a shear flow of cold protons outside of the current sheet, using a 2.5D Particle-In-Cell simulation. The effect of shear flows on magnetic reconnection has investigated earlier, indicating a signifficant modification of the reconnection process. However, it is not clear how these effects will be influenced by the additional scale lengths introduced into the system by a cold ion flow. In particular we want to investigate how the current sheet and diffusion regions are altered by a cold shear flow on a kinetic level, and how the reconnection process is altered on ion scales and beyond. Preliminary results indicate that the shear flow introduces a tilt of the current sheet, which appears to be consistent with earlier studies. Results will be compared to our group’s earlier results involving symmetric and asymmetric flows of cold particles in the inflow regions, as well as existing simulations and observations of magnetic reconnection including warm shear flows.</p>

A large rotating structure around AB Doradus A at VLBI scale

2019 ◽  
Vol 15 (S354) ◽  
pp. 189-194
Author(s):  
J. B. Climent ◽  
J. C. Guirado ◽  
R. Azulay ◽  
J. M. Marcaide
Keyword(s):  
Magnetic Reconnection ◽  
Main Sequence ◽  
Complex Structure ◽  
Main Sequence Star ◽  
Polar Cap ◽  
Vlbi Observations ◽  
Rotating Structure ◽  
Source Structure ◽  
Expected Position

AbstractWe report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.

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