Search Publications
Nonlinear evolutions of large amplitude oblique whistler waves
Yoon, Peter H.; Hwang, Kyoung-Joo; Min, Kyoung-Wook +3 more
This paper investigates nonlinear evolutions of large amplitude oblique whistler waves (LOWWs) and the interaction with electrons using one-dimensional electromagnetic kinetic simulations. The present research is motivated by recent studies about the nonlinear phenomena of LOWWs. When the propagation angle is not close to the resonance cone angle,…
Current sheet bending as destabilizing factor in magnetotail dynamics
Korovinskiy, D. B.; Semenov, V. S.; Erkaev, N. V. +2 more
The problem of the magnetohydrodynamical stability of bent magnetotail current sheets is considered by means of 2.5-dimensional numerical simulations. This study is focused on the cross-tail transversal mode, modeling the magnetotail flapping motions, at the background of the Kan-like magnetoplasma equilibrium. It is found that in symmetrical curr…
Electron holes in phase space: What they are and why they matter
Hutchinson, I. H.
This is a tutorial and selective review explaining the fundamental concepts and some currently open questions concerning the plasma phenomenon of the electron hole. The widespread occurrence of electron holes in numerical simulations, space-craft observations, and laboratory experiments is illustrated. The elementary underlying theory is developed…
Simulation of magnetic holes formation in the magnetosheath
Raeder, Joachim; Ahmadi, Narges; Germaschewski, Kai
Magnetic holes have been frequently observed in the Earth's magnetosheath and are believed to be the consequence of the nonlinear evolution of the mirror instability. Mirror mode perturbations mainly form as magnetic holes in regions where the plasma is marginally mirror stable with respect to the linear instability criterion. We present an expand…
Nonlinear propagation of kinetic Alfvén wave and turbulent spectrum in reconnection region of magnetotail
Sharma, R. P.; Yadav, Nitin; Sharma, Prachi +2 more
Kinetic Alfvén waves (KAWs) are known to play an important role in magnetic reconnection as well as in turbulence. In the present work, we have derived the dynamical equation of KAWs propagating through Harris sheet. It is assumed that background density gets modified due to nonlinearity and background field gets modified due to the presence of Ha…
Nonlinear evolution of 3D whistler waves in space plasmas
Sharma, R. P.; Pathak, Neha; Yadav, Nitin
The present model is proposed to study the nonlinear effects related to quasi-transverse 3D whistler waves in three different regions of space plasmas which are Earth's radiation belt, magnetopause, and solar wind plasma at 1 A.U. We have analysed the effect of considering the third dimension in the dynamics of whistler waves on Localization of wh…
Nonlinear effects associated with kinetic Alfvén wave in magnetic islands
Sharma, R. P.; Sharma, Swati; Yadav, Nitin +1 more
Observations show that kinetic Alfvén waves (KAWs) play a very important role in turbulence as well as in magnetic reconnection and have also been a topic of debate in the context of particle heating. In this paper, we aim to investigate the effect of magnetic islands on the dynamics of the nonlinear KAW. The formation of current sheet/coherent st…
Kinetic models of magnetic flux ropes observed in the Earth magnetosphere
Petrukovich, A. A.; Zelenyi, L. M.; Artemyev, A. V. +3 more
Magnetic flux ropes (MFR) are universal magnetoplasma structures (similar to cylindrical screw pinches) formed in reconnecting current sheets. In particular, MFR with scales from about the ion inertial length to MHD range are widely observed in the Earth magnetosphere. Typical MFR have force-free configuration with the axial magnetic field peaking…
Kinetic models of sub-ion cylindrical magnetic hole
Artemyev, A. V.; Vasko, I. Y.; Yushkov, E. V. +1 more
Magnetic holes are magnetoplasma structures very similar to the classical θ-pinch. They are widely observed in the space plasma and identified by the substantial magnetic field depressions on scales from magnetohydrodynamic range to electron scales. In this paper, we develop the kinetic models of cylindrically symmetric magnetic holes with sub-ion…
Study of electric and magnetic field fluctuations from lower hybrid drift instability waves in the terrestrial magnetotail with the fully kinetic, semi-implicit, adaptive multi level multi domain method
Lapenta, G.; Norgren, C.; Markidis, S. +3 more
The newly developed fully kinetic, semi-implicit, adaptive multi-level multi-domain (MLMD) method is used to simulate, at realistic mass ratio, the development of the lower hybrid drift instability (LHDI) in the terrestrial magnetotail over a large wavenumber range and at a low computational cost. The power spectra of the perpendicular electric fi…