Search Publications
Magnetosheath jet properties and evolution as determined by a global hybrid-Vlasov simulation
Kajdič, Primož; Blanco-Cano, Xóchitl; Karlsson, Tomas +9 more
We use a global hybrid-Vlasov simulation for the magnetosphere, Vlasiator, to investigate magnetosheath high-speed jets. Unlike many other hybrid-kinetic simulations, Vlasiator includes an unscaled geomagnetic dipole, indicating that the simulation spatial and temporal dimensions can be given in SI units without scaling. Thus, for the first time, …
Contrasting dynamics of electrons and protons in the near-Earth plasma sheet during dipolarization
Grigorenko, Elena E.; Kronberg, Elena A.; Daly, Patrick W. +4 more
The fortunate location of Cluster and the THEMIS P3 probe in the near-Earth plasma sheet (PS) (at X ∼ -7-9 RE) allowed for the multipoint analysis of properties and spectra of electron and proton injections. The injections were observed during dipolarization and substorm current wedge formation associated with braking of multiple bursty…
Turbulent processes in the Earth's magnetotail: spectral and statistical research
Grigorenko, Elena E.; Kronberg, Elena A.; Kozak, Liudmyla V. +3 more
We use the magnetic field measurements from four spacecraft of the Cluster-II mission (three events from 2005 to 2015) for the analysis of turbulent processes in the Earth's magnetotail. For this study we conduct the spectral, wavelet and statistical analysis. In the framework of statistical examination, we determine the kurtosis for selected even…
Cavitons and spontaneous hot flow anomalies in a hybrid-Vlasov global magnetospheric simulation
Jarvinen, Riku; Vainio, Rami; Dimmock, Andrew P. +12 more
In this paper we present the first identification of foreshock cavitons and the formation of spontaneous hot flow anomalies (SHFAs) with the Vlasiator global magnetospheric hybrid-Vlasov simulation code. In agreement with previous studies we show that cavitons evolve into SHFAs. In the presented run, this occurs very near the bow shock. We report …
Fast plasma sheet flows and X line motion in the Earth's magnetotail: results from a global hybrid-Vlasov simulation
Jarvinen, Riku; Juusola, Liisa; Pfau-Kempf, Yann +6 more
Fast plasma flows produced as outflow jets from reconnection sites or X lines are a key feature of the dynamics in the Earth's magnetosphere. We have used a polar plane simulation of the hybrid-Vlasov model Vlasiator, driven by steady southward interplanetary magnetic field and fast solar wind, to study fast plasma sheet ion flows and related magn…
A possible source mechanism for magnetotail current sheet flapping
Juusola, Liisa; Pfau-Kempf, Yann; Ganse, Urs +5 more
The origin of the flapping motions of the current sheet in the Earth's magnetotail is one of the most interesting questions of magnetospheric dynamics yet to be solved. We have used a polar plane simulation from the global hybrid-Vlasov model Vlasiator to study the characteristics and source of current sheet flapping in the center of the magnetota…
An excitation mechanism for discrete chorus elements in the magnetosphere
Bespalov, Peter; Savina, Olga
A beam pulsed amplifier mechanism responsible for effective amplification of short very low frequency (VLF) electromagnetic pulses is proposed. Effective amplification near the magnetic equator outside the plasmasphere is considered. A conditional growth rate of short electromagnetic pulses is calculated. Obtained results can explain some importan…
Multi-scale analysis of compressible fluctuations in the solar wind
Narita, Yasuhito; Roberts, Owen W.; Escoubet, C. -Philippe
Compressible plasma turbulence is investigated in the fast solar wind at proton kinetic scales by the combined use of electron density and magnetic field measurements. Both the scale-dependent cross-correlation (CC) and the reduced magnetic helicity (σm) are used in tandem to determine the properties of the compressible fluctuations at …
Multisatellite observations of the magnetosphere response to changes in the solar wind and interplanetary magnetic field
Angelopoulos, Vassilis; Sibeck, David; Thaller, Scott +5 more
We employ multipoint observations of the Van Allen Probes, THEMIS, GOES and Cluster to present case and statistical studies of the electromagnetic field, plasma and particle response to interplanetary (IP) shocks observed by the Wind satellite. On 27 February 2014 the initial encounter of an IP shock with the magnetopause occurred on the postnoon …
Tripolar electric field Structure in guide field magnetic reconnection
Huang, Shiyong; Fu, Song; Ni, Binbin +2 more
It has been shown that the guide field substantially modifies the structure of the reconnection layer. For instance, the Hall magnetic and electric fields are distorted in guide field reconnection compared to reconnection without guide fields (i.e., anti-parallel reconnection). In this paper, we performed 2.5-D electromagnetic full particle simula…