Search Publications
Electron hybrid code simulation of whistler-mode chorus generation with real parameters in the Earth's inner magnetosphere
Katoh, Yuto; Omura, Yoshiharu
We carry out a self-consistent simulation of the generation process of whistler-mode chorus by a spatially one-dimensional electron hybrid code, by assuming the magnetic field inhomogeneity corresponding to L = 4 of the dipole field. Chorus emissions with rising tones are reproduced in the simulation result, while the frequency range, sweep rate, …
Cluster observation of magnetohydrodynamic turbulence in the plasma sheet boundary layer
Narita, Y.
Measurement of turbulent magnetic field is presented from the Earth magnetotail crossing of the Cluster spacecraft on August 25, 2006, as an ideal case study of magnetohydrodynamic turbulence in the plasma sheet boundary layer on a spatial scale of about 10,000 km. The fluctuation energy of the magnetic field is evaluated in both the frequency and…
Relativistic electron acceleration during HILDCAA events: are precursor CIR magnetic storms important?
Hajra, Rajkumar; Tsurutani, Bruce T.; Gonzalez, Walter D. +4 more
We present a comparative study of high-intensity long-duration continuous AE activity (HILDCAA) events, both isolated and those occurring in the "recovery phase" of geomagnetic storms induced by corotating interaction regions (CIRs). The aim of this study is to determine the difference, if any, in relativistic electron acceleration and magnetosphe…
Further evidence for the role of magnetotail current shape in substorm initiation
Kubyshkina, D.; Gordeev, E.; Tsyganenko, N. +3 more
Substorm initiation still remains an unsolved problem, even though there is a consensus among most researchers that its main stages include dayside reconnection and substorm expansion. Dayside reconnection results in magnetotail flux buildup to a certain critical level, after which [or after the interplanetary magnetic field (IMF) Bz turns northwa…
Statistical investigation on the power-law behavior of magnetic fluctuations in the Venusian magnetosheath
Zhang, Tielong; Narita, Yasuhito; Schmid, Daniel +4 more
The present work aims to develop a better understanding of wave and turbulence processes in the planetary magnetosheath region. We study the plasma conditions (temperature, flow velocity, and magnetic field), the low-frequency wave properties, and the energy spectra for magnetic field fluctuations in the Venus magnetosheath. We use the magnetic fi…
Electron beam-associated symmetric electrostatic solitary waves on the separatrix of magnetic reconnection: multi-spacecraft analysis
Li, Shiyou; Zhang, Shifeng; Cai, Hong +1 more
We present an in situ evidence of electron beam-associated symmetric bipolar electrostatic solitary waves (ESWs) on the current sheet-side of the separatrix of the magnetic reconnection in the near-Earth magnetotail by multi-spacecraft observation of Cluster. Within one spin period, 42 cases of symmetric ESWs are continuously observed during 2 s b…
Strong induction effects during the substorm on 27 August 2001
Wang, C.; Pu, Z.; Mishin, V. M. +2 more
We report on strong induction effects notably contributing to the cross polar cap potential drop and the energy balance during the growth and active phases of the substorm on 27 August 2001. The inductance of the magnetosphere is found to be crucial for the energy balance and electrical features of the magnetosphere in the course of the substorm. …
The February 24, 2010 substorm: a refined view involving a pseudobreakup/expansive phase/poleward boundary intensification sequence
Russell, Christopher T.; McPherron, Robert L.; Chu, Xiangning +1 more
A substorm on February 24, 2010 was chosen for study by Connors et al. (Geophys. Res. Lett. 41:4449–4455, 2014) due to simple symmetric subauroral magnetic perturbations observed in North America. It was shown that a substorm current wedge (SCW) three-dimensional current model could represent these perturbations well, gave a reasonable representat…
A simulation study of the propagation of whistler-mode chorus in the Earth's inner magnetosphere
Katoh, Yuto
We study the propagation of whistler-mode chorus in the magnetosphere by a spatially two-dimensional simulation code in the dipole coordinates. We set the simulation system so as to assume the outside of the plasmapause, corresponding to the radial distance from 3.9 to 4.1 RE in the equatorial plane and the latitudinal range from ‑15° t…
The propagation of ULF waves from the Earth's foreshock region to ground: the case study of 15 February 2009
Regi, Mauro; De Lauretis, Marcello; Francia, Patrizia +1 more
A long-duration upstream ultralow frequency (ULF) wave event was detected on 15 February 2009 by Cluster satellites, close to the bow shock nose. A clear wave activity was identified when the interplanetary magnetic field orientation was favorable to the local generation. We examined the wave properties in both the solar wind and the spacecraft fr…