Search Publications
A review of pressure anisotropy caused by electron trapping in collisionless plasma, and its implications for magnetic reconnection
Daughton, William; Egedal, Jan; Le, Ari
From spacecraft data, it is evident that electron pressure anisotropy develops in collisionless plasmas. This is in contrast to the results of theoretical investigations, which suggest this anisotropy should be limited. Common for such theoretical studies is that the effects of electron trapping are not included; simply speaking, electron trapping…
Nonlinear electron acceleration by oblique whistler waves: Landau resonance vs. cyclotron resonance
Artemyev, A. V.; Agapitov, O. V.; Krasnoselskikh, V. V. +2 more
This paper is devoted to the study of the nonlinear interaction of relativistic electrons and high amplitude strongly oblique whistler waves in the Earth's radiation belts. We consider electron trapping into Landau and fundamental cyclotron resonances in a simplified model of dipolar magnetic field. Trapping into the Landau resonance corresponds t…
Comparison between hybrid and fully kinetic models of asymmetric magnetic reconnection: Coplanar and guide field configurations
Hesse, Michael; Aunai, Nicolas; Zenitani, Seiji +4 more
Magnetic reconnection occurring in collisionless environments is a multi-scale process involving both ion and electron kinetic processes. Because of their small mass, the electron scales are difficult to resolve in numerical and satellite data, it is therefore critical to know whether the overall evolution of the reconnection process is influenced…
Nonlinear interaction of kinetic Alfvén wave with fast magnetosonic wave and turbulent spectrum
Sharma, R. P.; Modi, K. V.
In the present paper, authors have investigated nonlinear interaction of kinetic Alfvén wave (KAW) and fast magnetosonic wave for intermediate β-plasma (me/mi≪β ≪1). Authors have developed the set of dimensionless equations in the presence of ponderomotive nonlinearity due to KAW in the dynamics of fast magnetosonic wave. Num…
Nonlinear interaction of kinetic Alfvén wave and whistler: Turbulent spectra and anisotropic scaling
Sharma, R. P.; Kumar Dwivedi, Navin
In this work, we are presenting the excitation of oblique propagating whistler wave as a consequence of nonlinear interaction between whistler wave and kinetic Alfvén wave (KAW) in intermediate beta plasmas. Numerical simulation has been done to study the transient evolution of magnetic field structures of KAW when the nonlinearity arises due to p…
Coherent structures and turbulent spectrum in solar wind plasmas
Sharma, R. P.; Yadav, N.; Kumari, Anju
The present paper investigates the localization of a uniform plane kinetic Alfvén wave (KAW) due to the coupling with the density/magnetic field fluctuations associated with a magnetosonic wave propagating in the transverse direction, i.e., perpendicular to the background magnetic field. To gain the physical insight into this evolution, a simplifi…
Nonlinear interaction of proton whistler with kinetic Alfvén wave to study solar wind turbulence
Goldstein, M. L.; Sharma, R. P.; Dwivedi, N. K. +1 more
This paper presents the nonlinear interaction between small but finite amplitude kinetic Alfvén wave (KAW) and proton whistler wave using two-fluid model in intermediate beta plasma, applicable to solar wind. The nonlinearity is introduced by modification in the background density. This change in density is attributed to the nonlinear ponderomotiv…