Search Publications
MMS Observation of Magnetic Reconnection in the Turbulent Magnetosheath
Lavraud, B.; Vaivads, A.; Le Contel, O. +30 more
In this paper we use the full armament of the MMS (Magnetospheric Multiscale) spacecraft to study magnetic reconnection in the turbulent magnetosheath downstream of a quasi-parallel bow shock. Contrarily to the magnetopause and magnetotail cases, only a few observations of reconnection in the magnetosheath have been reported. The case study in thi…
Rapid precipitation of radiation belt electrons induced by EMIC rising tone emissions localized in longitude inside and outside the plasmapause
Omura, Yoshiharu; Kubota, Yuko
By performing test particle simulations of relativistic electrons scattered by electromagnetic ion cyclotron (EMIC) rising tone emissions, we find a nonlinear scattering process named SLPA (Scattering at Low Pitch Angle) totally different from the nonlinear wave trapping. The nonlinear wave trapping, occurring for high pitch angles away from the l…
SAPS/SAID revisited: A causal relation to the substorm current wedge
Mishin, Evgeny; Nishimura, Yukitoshi; Foster, John
We present multispacecraft observations of enhanced flow/electric field channels in the inner magnetosphere and conjugate subauroral ionosphere, i.e., subauroral polarization streams (SAPS) near dusk and subauroral ion drifts (SAID) near midnight. The channels collocate with ring current (RC) injections lagging the onset of substorms by a few to ∼…
Broadband high-frequency waves detected at dipolarization fronts
Cao, J. B.; Yao, Z. H.; Fu, H. S. +3 more
Dipolarization front (DF) is a sharp boundary most probably separating the reconnection jet from the background plasma sheet. So far at this boundary, the observed waves are mainly in low-frequency range (e.g., magnetosonic waves and lower hybrid waves). Few high-frequency waves are observed in this region. In this paper, we report the broadband h…
Suprathermal electron acceleration in the near-Earth flow rebounce region
Cao, J. B.; Xu, Y.; Yao, Z. H. +4 more
Flux pileup regions (FPRs) are traditionally referred to the strong-Bz bundles behind dipolarization fronts (DFs) in the Earth's magnetotail and can appear both inside earthward and tailward bursty bulk flows. It has been widely reported that suprathermal electrons (40-200 keV) can be efficiently accelerated inside earthward FPRs, leavi…
A direct examination of the dynamics of dipolarization fronts using MMS
Russell, C. T.; Fazakerley, A. N.; Owen, C. J. +13 more
Energy conversion on the dipolarization fronts (DFs) has attracted much research attention through the suggestion that intense current densities associated with DFs can modify the more global magnetotail current system. The current structures associated with a DF are at the scale of one to a few ion gyroradii, and their duration is comparable to a…
The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission
Allen, R. C.; Deng, X. H.; Torbert, R. B. +5 more
Electromagnetic ion cyclotron (EMIC) waves can precipitate the ring current ions and relativistic electrons and heat the cold electrons in the magnetosphere. This requires comprehensive knowledge of the occurrence and wave properties of EMIC waves. In the present study, we used the data from one new mission, the Magnetospheric Multiscale (MMS) mis…
Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
Santolík, O.; Demekhov, A. G.; Taubenschuss, U.
We present results of numerical simulations of VLF chorus emissions based on the backward wave oscillator model and compare them with Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft data from the equatorial chorus source region on the early morning side at a radial distance of 6 Earth radii. Specific attenti…
On the Dawn-Dusk Asymmetry of the Kelvin-Helmholtz Instability Between 2007 and 2013
Nykyri, K.; Moore, T. W.; Dimmock, A. P. +2 more
Using data from Time History of Events and Macroscale Interactions during Substorms (THEMIS), a statistical study was performed to determine whether a dawn-dusk asymmetry exists in the occurrence rates of the Kelvin-Helmholtz instability during Parker-Spiral (PS) and Ortho-Parker-Spiral (OPS) orientations of the interplanetary magnetic field (IMF)…
Timescales for the penetration of IMF By into the Earth's magnetotail
Milan, S. E.; Fear, R. C.; Grocott, A. +1 more
Previous studies have shown that there is a correlation between the By component of the interplanetary magnetic field (IMF) and the By component observed in the magnetotail lobe and in the plasma sheet. However, studies of the effect of IMF By on several magnetospheric processes have indicated that the By