scholarly journals Whistler waves associated with magnetic reconnection

2008 ◽  
Vol 35 (19) ◽  
Author(s):  
Keizo Fujimoto ◽  
Richard D. Sydora
Keyword(s):  
Magnetic Reconnection ◽  
Whistler Waves

Bursty magnetic reconnection under slow shock-generated whistler waves

2014 ◽  
Vol 119 (9) ◽  
pp. 7495-7500 ◽  
Author(s):  
Z. W. Ma ◽  
L. N. Wu ◽  
L. J. Li ◽  
L. C. Wang
Keyword(s):  
Magnetic Reconnection ◽  
Whistler Waves ◽  
Slow Shock

scholarly journals Bursty emission of whistler waves in association with plasmoid collision

2017 ◽  
Vol 35 (4) ◽  
pp. 885-892 ◽  
Author(s):  
Keizo Fujimoto
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
Magnetic Reconnection ◽  
High Energy ◽  
Temperature Anisotropy ◽  
Whistler Waves ◽  
High Energy Electrons ◽  
Parallel Direction ◽  
Short Time ◽  
Particle Energization

Abstract. A new mechanism to generate whistler waves in the course of collisionless magnetic reconnection is proposed. It is found that intense whistler emissions occur in association with plasmoid collisions. The key processes are strong perpendicular heating of the electrons through a secondary magnetic reconnection during plasmoid collision and the subsequent compression of the ambient magnetic field, leading to whistler instability due to the electron temperature anisotropy. The emissions have a bursty nature, completing in a short time within the ion timescales, as has often been observed in the Earth's magnetosphere. The whistler waves can accelerate the electrons in the parallel direction, contributing to the generation of high-energy electrons. The present study suggests that the bursty emission of whistler waves could be an indicator of plasmoid collisions and the associated particle energization during collisionless magnetic reconnection.

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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