Search Publications
On the origin of magnetosheath plasmoids and their relation to magnetosheath jets
Gunell, H.; Nilsson, H.; Hamrin, M. +4 more
We investigate localized magnetosheath and solar wind density enhancements, associated with clear magnetic field changes, and therefore referred to as magnetosheath/solar wind plasmoids, respectively. Using Cluster data, we show that there are two distinct populations of magnetosheath plasmoids, one associated with a decrease of magnetic field str…
Properties and origin of subproton-scale magnetic holes in the terrestrial plasma sheet
Burgess, D.; Sundberg, T.; Haynes, C. T.
Electron-scale magnetic depressions in the terrestrial plasma sheet are studied using Cluster multispacecraft data. The structures, which have an observed duration of ~5-10 s, are approximately 200-300 km wide in the direction of propagation, and they show an average reduction in the background magnetic field of 10-20%. A majority of the events ar…
Data-driven modeling of the solar wind from 1 Rs to 1 AU
Feng, Xueshang; Xiang, Changqing; Ma, Xiaopeng
We present here a time-dependent three-dimensional magnetohydrodynamic (MHD) solar wind simulation from the solar surface to the Earth's orbit driven by time-varying line-of-sight solar magnetic field data. The simulation is based on the three-dimensional (3-D) solar-interplanetary (SIP) adaptive mesh refinement (AMR) space-time conservation eleme…
A computational and theoretical investigation of nonlinear wave-particle interactions in oblique whistlers
Omura, Yoshiharu; Nunn, David
Most previous work on nonlinear wave-particle interactions between energetic electrons and VLF waves in the Earth's magnetosphere has assumed parallel propagation, the underlying mechanism being nonlinear trapping of cyclotron resonant electrons in a parabolic magnetic field inhomogeneity. Here nonlinear wave-particle interaction in oblique whistl…
Electron acceleration in the dipolarization front driven by magnetic reconnection
Wang, Shui; Huang, Can; Lu, Quanming +2 more
A large-scale two-dimensional (2-D) particle-in-cell simulation is performed in this paper to investigate electron acceleration in the dipolarization front (DF) region during magnetic reconnection. It is found that the DF is mainly driven by an ion outflow which also generates a positive potential region behind the DF. The DF propagates with an al…
A forecasting model of the magnetosphere driven by an optimal solar wind coupling function
Tsyganenko, N. A.; Andreeva, V. A.
A new empirical magnetospheric magnetic field model is described, driven by interplanetary parameters including a coupling function by Newell et al. (2007), termed henceforth as "N index." The model uses data from Polar, Geotail, Cluster, and Time History of Events and Macroscale Interactions during Substorms satellites, obtained in 1995-2013 at d…
Systematic analysis of occurrence of equatorial noise emissions using 10 years of data from the Cluster mission
Santolík, O.; Němec, F.; Cornilleau-Wehrlin, N. +2 more
We report results of a systematic analysis of equatorial noise (EN) emissions which are also known as fast magnetosonic waves. EN occurs in the vicinity of the geomagnetic equator at frequencies between the local proton cyclotron frequency and the lower hybrid frequency. Our analysis is based on the data collected by the Spatio-Temporal Analysis o…
Control of the topside Martian ionosphere by crustal magnetic fields
Gurnett, D. A.; Edberg, N. J. T.; Němec, F. +4 more
We present observations from the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) instrument onboard Mars Express of the thermal electron plasma density of the Martian ionosphere and investigate the extent to which it is influenced by the presence of Mars's remnant crustal magnetic fields. We use locally measured electron densi…
Lower hybrid drift instability at a dipolarization front
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +1 more
We present observations of a reconnection jet front detected by the Cluster satellites in the magnetotail of Earth, which are commonly referred to as dipolarization fronts. We investigate in detail electric field structures observed at the front which have frequency in the lower hybrid range and amplitudes reaching 40 mV/m. We determine the freque…
Interpreting Mars ionospheric anomalies over crustal magnetic field regions using a 2-D ionospheric model
Withers, Paul; Mendillo, Michael; Matta, Majd +1 more
spatially inhomogeneous, small-scale crustal magnetic fields of Mars influence the escape of planetary atmospheric species and the interaction of the solar wind with the ionosphere. Understanding the plasma response to crustal magnetic field regions can therefore provide insight to ionospheric structure and dynamics. To date, several localized spa…