Search Publications
Solar wind dependence of ion parameters in the Earth's magnetospheric region calculated from CLUSTER observations
Taylor, M. G. G. T.; Denton, M. H.
Moments calculated from the ion distributions (~0-40 keV) measured by the Cluster Ion Spectrometry (CIS) instrument are combined with data from the Cluster Flux Gate Magnetometer (FGM) instrument and used to characterise the bulk properties of the plasma in the near-Earth magnetosphere over five years (2001-2005). Results are presented in the form…
Plasma transport along discrete auroral arcs and its contribution to the ionospheric plasma convection
Fazakerley, A. N.; Nilsson, H.; Buchert, S. +6 more
The role of intense high-altitude electric field (E-field) peaks for large-scale plasma convection is investigated with the help of Cluster E-field, B-field and density data. The study covers 32 E-field events between 4 and 7 RE geocentric distance, with E-field magnitudes in the range 500 1000 mV/m when mapped to ionospheric altitude. …
Bifurcation of the tail current sheet and ion temperature anisotropy
Israelevich, P. L.; Ershkovich, A. I.
We investigated the relation between the geotail current sheet structure and the anisotropy of the ion temperature in the plasma sheet. Current density distribution in the geomagnetic tail is shown not to depend on the ratio between the parallel and perpendicular ion temperature. The tail current sheet bifurcation is controlled by non-gyrotropicit…
Reconstruction of time-varying reconnection rate and X-line location
Semenov, V. S.; Ivanov, I. B.; Kiehas, S. A. +2 more
Remote-sensing method developed on the basis of time-dependent Petschek-type reconnection model is applied to Cluster magnetotail measurements from 8 September 2002, where a series of earthward propagating NFTEs (nightside flux transfer events) was observed. The method utilizes single-spacecraft magnetic data as an input and provides the reconnect…
Reconnection in a slow Coronal Mass Ejection
Romoli, M.; Bemporad, A.; Landini, F. +1 more
This paper aims at studying reconnection occurring in the aftermath of the 28 May 2004, CME, first imaged by the LASCO (Large Angle and Spectrometric Coronagraph) C2 at 11:06 UT. The CME was observed in White Light and UV radiation: images acquired by the LASCO C2 and C3 coronagraphs and spectra acquired by UVCS (Ultraviolet Coronagraph Spectromet…
Conjugate observation of sharp dynamical boundary in the inner magnetosphere by Cluster and DMSP spacecraft and ground network
Nakamura, R.; Sergeev, V. A.; Baumjohann, W. +9 more
We investigate an unusual sharp boundary separating two plasma populations (inner magnetospheric plasma with high fluxes of energetic particles and plasma sheet) observed by the Cluster quartet near its perigee on 16 December 2003. Cluster was in a pearl-on-string configuration at 05:00 MLT and mapped along magnetic field lines to ~8 9 RE
Structure of the near-Earth plasma sheet during tailward flows
Balogh, A.; Nakamura, R.; Fujimoto, M. +10 more
A detailed analysis of successive tailward flow bursts in the near-Earth magnetotail (X~-19 RE) plasma sheet is performed on the basis of in-situ multi-point observations by the Cluster spacecraft on 15 September 2001. The tailward flows were detected during a northward IMF interval, 2.5 h after a substorm expansion. Each flow burst (V<…
Non-thermal particle effects on the Hα and Hβ line profiles in the 18 August 2002 solar flare
Kashapova, L. K.; Kotrč, P.; Kupryakov, Yu. A.
We present results of the 18 August 2002 flare analysis as an example for developing a diagnostic tool for thermal and non-thermal processes in chromospheric lines. Taking into account the hard X-ray (HXR) emission, we attempted to derive the Hα and Hβ line properties which were caused by the non-thermal electron contribution and could be useful f…
Momentum transfer at the high-latitude magnetopause and boundary layers
Farrugia, C. J.; Lund, E. J.; Sandholt, P. E.
The Hall current system revealed as a statistical significant pattern during fast flows
Nakamura, R.; Snekvik, K.; Østgaard, N. +2 more
We have examined the dawn-dusk component of the magnetic field, BY, in the night side current sheet during fast flows in the neutral sheet. 237 h of Cluster data from the plasma sheet between 2 August 2002 and 2 October 2002 have been analysed. The spatial pattern of BY as a function of the distance from the centre of the cur…