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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…
Three-dimensional density and compressible magnetic structure in solar wind turbulence
Narita, Yasuhito; Roberts, Owen W.; Escoubet, C. -Philippe
The three-dimensional structure of both compressible and incompressible components of turbulence is investigated at proton characteristic scales in the solar wind. Measurements of the three-dimensional structure are typically difficult, since the majority of measurements are performed by a single spacecraft. However, the Cluster mission consisting…
A new method to identify flux ropes in space plasmas
He, Jiansen; Yuan, Zhigang; Yu, Xiongdong +10 more
Flux ropes are frequently observed in the space plasmas, such as solar wind, planetary magnetosphere and magnetosheath etc., and play an important role in the reconnection process and mass and flux transportation. One usually uses bipolar signature and strong core field to identify the flux ropes. We propose here one new method to identify flux ro…
Energy conversion through mass loading of escaping ionospheric ions for different Kp values
Slapak, Rikard; Yamauchi, Masatoshi
By conserving momentum during the mixing of fast solar wind flow and slow planetary ion flow in an inelastic way, mass loading converts kinetic energy to other forms - e.g. first to electrical energy through charge separation and then to thermal energy (randomness) through gyromotion of the newly born cold ions for the comet and Mars cases. Here, …
Non-Gaussianity and cross-scale coupling in interplanetary magnetic field turbulence during a rope-rope magnetic reconnection event
Miranda, Rodrigo A.; Chian, Abraham C. -L.; Schelin, Adriane B. +1 more
In a recent paper (Chian et al., 2016) it was shown that magnetic reconnection at the interface region between two magnetic flux ropes is responsible for the genesis of interplanetary intermittent turbulence. The normalized third-order moment (skewness) and the normalized fourth-order moment (kurtosis) display a quadratic relation with a parabolic…
Statistical survey of day-side magnetospheric current flow using Cluster observations: bow shock
Glassmeier, Karl-Heinz; Liebert, Evelyn; Nabert, Christian
We present the first comprehensive statistical survey of the day-side terrestrial bow shock current system based on a large number of Cluster spacecraft bow shock crossings. Calculating the 3-D current densities using fluxgate magnetometer data and the curlometer technique enables the investigation of current locations, directions, and magnitudes …