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Kinetic Alfven Waves Excited in Two-Dimensional Magnetic Reconnection
Huang, Hongtao1; Yu, Yiqun1; Dai, Lei2; Wang, Tieyan3
AbstractKinetic Alfven waves (KAWs) are believed to be capable of efficiently transporting energy and play an important role in facilitating magnetic reconnection. KAW eigenmode theory suggests that Hall fields can be considered as the components of KAW, providing a mechanism for the generation and dissipation of KAW in magnetic reconnection. Using particle-in-cell simulations, we examined Hall fields in the magnetic reconnection region and found that (1) Hall electric filed is balanced by the ion pressure gradient and (2) the ratio of Hall electric field to Hall magnetic field is on the order of Alfven speed. These results are consistent with KAW physics. Simulation results also indicate that KAWs are excited in the reconnection site and then transmitted along the separatrices. The wave Poynting flux propagates parallel to the magnetic field lines, carrying substantial energy. It is further found that a thinner current sheet provides a favorable condition for the excitation of KAW and results in a higher ratio of the Hall fields. Plain Language Summary Magnetic reconnection occurs in space and laboratory plasmas and results in energy conversion. In this report, we investigate the characteristics of Hall fields in magnetic reconnection by means of particle-in-cell (PIC) simulations. Our results are consistent with kinetic Alfven waves (KAWs) eigenmode theory. In our simulation, KAWs are excited accompanied with the reconnection and propagate parallel to the magnetic field line. Furthermore, we investigate the effects of current sheet thickness on the properties of KAW. The results show that a thinner current sheet can lead to a higher KAW propagation velocity.
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Document Type期刊论文
Affiliation1.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China;
2.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China;
3.Rutherford Appleton Lab, RAL Space, Didcot, Oxon, England
Recommended Citation
GB/T 7714
Huang, Hongtao,Yu, Yiqun,Dai, Lei,et al. Kinetic Alfven Waves Excited in Two-Dimensional Magnetic Reconnection[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(8):6655-6669.
APA Huang, Hongtao,Yu, Yiqun,Dai, Lei,&Wang, Tieyan.(2018).Kinetic Alfven Waves Excited in Two-Dimensional Magnetic Reconnection.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(8),6655-6669.
MLA Huang, Hongtao,et al."Kinetic Alfven Waves Excited in Two-Dimensional Magnetic Reconnection".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.8(2018):6655-6669.
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