Search Publications
Motion of the dipolarization front during a flow burst event observed by Cluster
Balogh, A.; Zhang, T. L.; Dandouras, I. +12 more
In this paper we study a flow burst event which took place during enhanced geomagnetic activity on July 22, 2001, when Cluster was located in the postmidnight magnetotail. The flow burst was associated with a clear dipolarization ahead of the high-speed part of the predominantly Earthward directed flow. Based on the analysis of the four spacecraft…
A wavy twisted neutral sheet observed by CLUSTER
Balogh, A.; Zhang, T. L.; Glassmeier, K. -H. +2 more
From July to October 2001, the Cluster satellites were located within the magnetotail and crossings of the neutral sheet were frequently observed by the FGM instrument [Balogh et al., 2001]. The neutral sheet often appears to be moving relative to the spacecraft. Multiple crossings of the neutral sheet on August 3, 2001 are analysed. These neutral…
Fast flow during current sheet thinning
Balogh, A.; Zhang, T. L.; Klecker, B. +9 more
In this paper we report Cluster observation of a fast flow event in the plasma sheet associated with a small auroral substorm intensification at 1838 UT on August 12, 2001. Cluster, located in the plasma sheet, experienced significant thinning of the current sheet associated with a high-speed Earthward flow of 900 km/s. By using the four spacecraf…
Timing of magnetic reconnection initiation during a global magnetospheric substorm onset
Daly, P. W.; Dunlop, M. W.; Baker, D. N. +13 more
We have used a unique constellation of Earth-orbiting spacecraft and ground-based measurements in order to study a relatively isolated magnetospheric substorm event on August 27, 2001. Global ultraviolet images of the northern auroral region established the substorm expansion phase onset at 0408:19 (+/-1 min) UT. Concurrent measurements from the G…
Density modulated whistler mode emissions observed near the plasmapause
Santolik, O.; Parrot, M.; Andre, M. +4 more
Electron density fluctuations are regularly observed near the plasmapause together with electromagnetic waves below the electron cyclotron frequency (usually called hiss or chorus). Instruments on board CLUSTER spacecraft often observe two such emission bands with fluctuating wave intensities that suggest wave ducting in density enhancements as we…
Cluster observations of the exterior cusp and its surrounding boundaries under northward IMF
Lundin, R.; Sauvaud, J. -A.; Escoubet, C. P. +18 more
We have studied in detail multi-spacecraft observations of the exterior cusp on 04 February 2001, during a steady northward Interplanetary Magnetic Field (IMF) interval. At a radial distance of 11 Re, Cluster encountered a well-bounded region where the magnetic field exhibited very low diamagnetic values and the ions displayed high levels of isotr…
Cluster observations of fast magnetosonic waves in the terrestrial foreshock
Balogh, A.; Dandouras, I.; Eastwood, J. P. +2 more
Cluster observations of ULF waves in the terrestrial foreshock are presented. Four spacecraft timing techniques on magnetic field measurements are used with plasma bulk velocity measurements to determine wave properties in the plasma rest frame. Based on the propagation speed and polarisation, the waves are found to be fast magnetosonic. The analy…
A telescopic and microscopic view of a magnetospheric substorm on 31 March 2001
Mitchell, D. G.; Daly, P. W.; Baker, D. N. +6 more
On March 31, 2001 at ~0635 UT when the CLUSTER constellation was near local midnight and at ~4 RE geocentric distance, sensors observed an energetic electron injection event associated with a strong (AE ~ 1200 nT) magnetospheric substorm. Geostationary spacecraft 1991-080 located at ~20 LT also saw an abrupt electron injection event at …
Three-dimensional energetic ion sounding of the magnetopause using Cluster/RAPID
Zong, Q. -G.; Fritz, T. A.; Wilken, B. +2 more
We present new results using energetic particles to remotely sound the high-latitude magnetopause in three-dimensions. Less than two gyro radii from an absorbing boundary a trapped particle distribution appears non-gyrotropic, as particles start to cross the boundary. Knowing the magnetic field and the particle mass and energy, it is possible to d…