Search Publications
Double layer electric fields aiding the production of energetic flat-top distributions and superthermal electrons within magnetic reconnection exhausts
Borg, A. L.; Egedal, J.; Daughton, W. +1 more
Using a kinetic simulation of magnetic reconnection, it was recently shown that magnetic-field-aligned electric fields (E∥) can be present over large spatial scales in reconnection exhausts. The largest values of E∥ are observed within double layers. The existence of double layers in the Earth's magnetosphere is well document…
Double-reconnected magnetic structures driven by Kelvin-Helmholtz vortices at the Earth's magnetosphere
Califano, F.; Pegoraro, F.; Faganello, M. +1 more
In an almost collisionless magnetohydrodynamic plasma in a relatively strong magnetic field, stresses can be conveyed far from the region where they are exerted, e.g., through the propagation of Alfvèn waves. The forced dynamics of line-tied magnetic structures in solar and stellar coronae (see, e.g., A. F. Rappazzo and E. N. Parker, Astrophys. J.…
Observation and numerical modeling of chromospheric evaporation during the impulsive phase of a solar flare
Watanabe, Tetsuya; Murakami, Izumi; Imada, Shinsuke
We have studied the chromospheric evaporation flow during the impulsive phase of the flare by using the Hinode/EUV Imaging Spectrometer observation and 1D hydrodynamic numerical simulation coupled to the time-dependent ionization. The observation clearly shows that the strong redshift can be observed at the base of the flaring loop only during the…
Current sheets with inhomogeneous plasma temperature: Effects of polarization electric field and 2D solutions
Artemyev, A. V.; Vasko, I. Y.; Zimbardo, G. +1 more
We develop current sheet models which allow to regulate the level of plasma temperature and density inhomogeneities across the sheet. These models generalize the classical Harris model via including two current-carrying plasma populations with different temperature and the background plasma not contributing to the current density. The parameters o…
3D magnetic field configuration of small-scale reconnection events in the solar plasma atmosphere
Shimizu, T.
The outer solar atmosphere, i.e., the corona and the chromosphere, is replete with small energy-release events, which are accompanied by transient brightening and jet-like ejections. These events are considered to be magnetic reconnection events in the solar plasma, and their dynamics have been studied using recent advanced observations from the H…
The double-gradient magnetic instability: Stabilizing effect of the guide field
Korovinskiy, D. B.; Semenov, V. S.; Erkaev, N. V. +7 more
The role of the dawn-dusk magnetic field component in stabilizing of the magnetotail flapping oscillations is investigated in the double-gradient model framework (Erkaev et al., Phys. Rev. Lett. 99, 235003 (2007)), extended for the magnetotail-like configurations with non-zero guide field By. Contribution of the guide field is examined …
Kinetic structures of quasi-perpendicular shocks in global particle-in-cell simulations
Henri, Pierre; Khotyaintsev, Yuri; Johlander, Andreas +5 more
We carried out global Particle-in-Cell simulations of the interaction between the solar wind and a magnetosphere to study the kinetic collisionless physics in super-critical quasi-perpendicular shocks. After an initial simulation transient, a collisionless bow shock forms as a result of the interaction of the solar wind and a planet magnetic dipol…
Evolution of Kelvin-Helmholtz instability at Venus in the presence of the parallel magnetic field
Zhang, T. L.; Cao, J. B.; Fu, H. S. +2 more
Two-dimensional MHD simulations were performed to study the evolution of the Kelvin-Helmholtz (KH) instability at the Venusian ionopause in response to the strong flow shear in presence of the in-plane magnetic field parallel to the flow direction. The physical behavior of the KH instability as well as the triggering and occurrence conditions for …
Pitch-angle diffusion of electrons through growing and propagating along a magnetic field electromagnetic wave in Earth's radiation belts
Park, Y. -D.; Dokgo, K.; Lee, D. -Y. +5 more
The diffusion of electrons via a linearly polarized, growing electromagnetic (EM) wave propagating along a uniform magnetic field is investigated. The diffusion of electrons that interact with the growing EM wave is investigated through the autocorrelation function of the parallel electron acceleration in several tens of electron gyration timescal…
Stochastic acceleration of ions driven by Pc1 wave packets
Sibeck, D. G.; Khazanov, G. V.; Tel'nikhin, A. A. +1 more
The stochastic motion of protons and He+ ions driven by Pc1 wave packets is studied in the context of resonant particle heating. Resonant ion cyclotron heating typically occurs when wave powers exceed 10-4 nT2/Hz. Gyroresonance breaks the first adiabatic invariant and energizes keV ions. Cherenkov resonances with t…