Search Publications
Energetic particle distributions in space physics represented by the Pearson differential equation for the kappa distribution
Shizgal, Bernie D.
The kappa distribution has been used for decades as a numerical fitting function to represent the energetic particle distributions measured with satellite instruments. The distributions are generally either a three dimensional distribution in the particle velocity or the one dimensional distribution in a velocity component in a particular directio…
Dipolar and Kelvin-Stuart's cat's eyes vortices in magnetoplasmas with non-Maxwellian electron distribution
Masood, W.; Naeem, Ismat; Mirza, Arshad M.
Linear and nonlinear propagation characteristics of drift ion acoustic waves are analyzed in an inhomogeneous plasma comprising of warm ions having shear flow parallel to the magnetic field and electrons that are followed by a distribution which is dictated by spectral indices,
Spectrum of imbalanced Alfvénic turbulence at ion-kinetic scales in the solar wind
Voitenko, Y. M.; Gogoberidze, G.
Using a semi-phenomenological model of the imbalanced Alfvénic turbulence, we study the turbulence transition from magnetohydrodynamic to sub-ion kinetic scales in the conditions typical for the fast solar wind. We show that the transition takes place in a wide wave number interval where the energy spectrum does not follow any power law. For large…
Implication of kinetic Alfvén waves to magnetic field turbulence spectra: Earth's magnetosheath
Khodachenko, M. L.; Kumar, S.; Echim, M. +5 more
In the present paper, we investigate the power-law behaviour of the magnetic field spectra in the Earth's magnetosheath region using Cluster spacecraft data under solar minimum condition. The power spectral density of the magnetic field data and spectral slopes at various frequencies are analysed. Propagation angle,
Nonlinear model to study filamentation instability of circularly polarized dispersive Alfvén waves in solar wind plasmas
Sharma, R. P.; Sharma, Swati; Mishra, M. K.
This paper examines the small-scale solar wind turbulence driven in view of the Alfvén waves subjected to ponderomotive nonlinearity. Filamentation instability is known to take place for the case of dispersive Alfvén wave (DAW) propagating parallel to the ambient magnetic field. The ponderomotive force associated with DAW is responsible for wave l…
A two-fluid modeling of kinetic Alfvén wave turbulence
Moon, Y. -J.; Sharma, R. P.; Dwivedi, Navin Kumar +1 more
We present an analytical model to explore the magnetic field turbulent spectrum by coupled high-frequency kinetic Alfvén wave (KAW) and slow mode of Alfvén wave (AW). The spectrum is computed as a realization of energy cascades from larger to smaller scales for a specific case of solar wind plasma at 1 AU. A two-fluid technique is implemented for …
Electron acceleration in the near-Earth magnetotail: test particle calculations in electromagnetic fields from two-dimensional hybrid simulations
Wu, Mingyu; Du, Aimin; Guo, Zhifang
Electron acceleration in the near-Earth magnetotail during the substorm period is still an unresolved question. In this paper, by tracing electron trajectories in the dynamically evolving electromagnetic fields obtained from a two-dimensional (2D) global hybrid simulation, we investigate electron acceleration in the near-Earth magnetotail during d…
Double-cusp simulation during northward IMF using 3D PIC global code
Esmaeili, Amin; Kalaee, Mohammad Javad
The cusp has important effects on the transportation of particles and their energy from the solar wind to the magnetosphere, and ionosphere, and high-altitude atmosphere. The cusp can be considered to be a part of the magnetospheric boundary layer with weaker magnetic fields. It has been studied since 1971 by different satellite observations. Desp…
Nonlinear evolution of oblique whistler waves in radiation belts
Sharma, R. P.; Sharma, Swati; Nandal, P. +1 more
Magnetic power spectrum and formation of coherent structures have been investigated in the present work applicable to Van Allen radiation belt. The nonlinear interaction of high frequency oblique whistler wave and low frequency magnetosonic wave has been investigated. Simulation was performed of the coupled equation of these two waves. The nonline…
Energy budget during an isolated substorm using measurements of multi satellites and geomagnetic indices
Dunlop, M. W.; Ma, Yuduan; Yang, Jian +1 more
Measurements of multi satellites and geomagnetic indices are used to investigate the energy budget during an isolated substorm. The calculation of the energy transfer from the solar wind to the magnetosphere (parameter