Search Publications
Anomalous magnetosheath flows and distorted subsolar magnetopause for radial interplanetary magnetic fields
Glassmeier, K. H.; Plaschke, F.; McFadden, J. P. +5 more
On 12 August 2007 from 1436 to 1441 UT, when the five THEMIS probes (THA, THB, THC, THD, and THE) were located near the subsolar magnetopause, a sunward flow was observed in the magnetosheath. A fast anti-sunward flow (-280 km/s) was observed in the magnetosheath before the sunward flow. Although THA observed this fast anti-sunward flow, THC and T…
Source regions of banded chorus
Pickett, J. S.; Inan, U. S.; Bell, T. F. +1 more
ELF/VLF chorus emissions are very intense electromagnetic plasma waves that are naturally and spontaneously excited near the magnetic equatorial plane outside the plasmasphere during periods of magnetic disturbance. These emissions are believed to play an important role in the acceleration of 10 to 100 keV radiation belt electrons to MeV energies …
Regions associated with electron physics in asymmetric magnetic field reconnection
Pritchett, P. L.; Mozer, F. S.
Spatial relationships between regions containing signatures of electron physics in asymmetric reconnection with a guide field are examined using simulations and space observations that are in excellent agreement. These electron physics regions do not completely overlap, are not confined to sizes ∼electron skin depth, and do not surround the X-line…
Stochastic and direct acceleration mechanisms in the Earth's magnetotail
Perri, S.; Zimbardo, G.; Greco, A.
Ion beams with energies of the order of several tens of keV are frequently observed in the Earth's magnetotail. Here we consider two possible acceleration mechanisms, the cross tail electric field E y and the stochastic acceleration due to the electromagnetic fluctuations present in the magnetotail. Electromagnetic perturbations are g…
Tracing solar wind plasma entry into the magnetosphere using ion-to-electron temperature ratio
Berchem, J.; Escoubet, C. P.; Dandouras, I. +22 more
When the solar wind Mach number is low, typically such as in magnetic clouds, the physics of the bow shock leads to a downstream ion-to-electron temperature ratio that can be notably lower than usual. We utilize this property to trace solar wind plasma entry into the magnetosphere by use of Cluster measurements in the vicinity of the dusk magnetop…
A magnetospheric generator driving ion and electron acceleration and electric currents in a discrete auroral arc observed by Cluster and DMSP
Roth, M.; De Keyser, J.; Maggiolo, R. +1 more
Simultaneous observations on April 28, 2001 by Cluster and DMSP-F14 reveal a stable discrete auroral arc and fluxes of field-aligned accelerated electrons and ions coincident with a magnetospheric plasma interface at an altitude of 4.5 RE in the dusk sector. We compare satellite data with a quasi-stationary magnetosphere-ionosphere coup…
Cavities of weak magnetic field strength in the wake of FTEs: Results from global magnetospheric MHD simulations
Toth, G.; Hesse, M.; Wang, Y. +4 more
We use the global magnetohydrodynamic (MHD) code BATS-R-US to model multipoint observations of Flux Transfer Event (FTE) signatures. Simulations with high spatial and temporal resolution predict that cavities of weak magnetic field strength protruding into the magnetosphere trail FTEs. These predictions are consistent with recently reported multi-…
Magnetopause reconnection impact parameters from multiple spacecraft magnetic field measurements
Wendel, Deirdre E.; Reiff, Patricia H.
We present a novel technique that exploits multiple spacecraft data to determine the impact parameters of the most general form of magnetic reconnection at the magnetopause. The method consists of a superposed epoch of multiple spacecraft magnetometer measurements that yields the instantaneous magnetic spatial gradients near a magnetopause reconne…
Reconnection Hall current system observed in the magnetotail and in the ionosphere
Snekvik, K.; Østgaard, N.; Amm, O. +1 more
On 07 Sep 2001 around 21:40 UT, Cluster was located 19 R E downtail, and observed earthward fast flows and strong perturbations in the dawn-dusk component of the magnetic field (B Y ). The perturbations corresponded to a sheet of tailward field aligned current close to the neutral sheet and another sheet of earthward field…