Search Publications
Derivation of inner magnetospheric electric field (UNH-IMEF) model using Cluster data set
Khotyaintsev, Y.; Torbert, R. B.; Matsui, H. +3 more
We derive an inner magnetospheric electric field (UNH-IMEF) model at L=2 10 using primarily Cluster electric field data for more than 5 years between February 2001 and October 2006. This electric field data set is divided into several ranges of the interplanetary electric field (IEF) values measured by ACE. As ring current simulations which requir…
EISCAT and Cluster observations in the vicinity of the dynamical polar cap boundary
Dandouras, I.; Amm, O.; Fazakerley, A. +5 more
The dynamics of the polar cap boundary and auroral oval in the nightside ionosphere are studied during late expansion and recovery of a substorm from the region between Tromsø (66.6° cgmLat) and Longyearbyen (75.2° cgmLat) on 27 February 2004 by using the coordinated EISCAT incoherent scatter radar, MIRACLE magnetometer and Cluster satellite measu…
Are there current-sheet-like structures in the Earth's magnetotail as in the solar wind - results and implications from high time resolution magnetic field measurements by Cluster
Li, G.; Lee, E.; Parks, G.
Recent studies of solar wind MHD turbulence show that current-sheet-like structures are common in the solar wind and they are a significant source of solar wind MHD turbulence intermittency. While numerical simulations have suggested that such structures can arise from non-linear interactions of MHD turbulence, a recent study by Borovsky (2006), u…
Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events
Forsyth, R. J.; Marsden, R. G.; Tranquille, C. +3 more
We report recent observations of energetic particles at energies 1-40 MeV/n made by the COSPIN/LET instrument onboard the Ulysses spacecraft during the period of intense solar activity in August/September 2005 during the declining phase of solar cycle 23. Ulysses, having started its climb to high southern latitudes for the third time, was located …
Analysis of plasma waves observed in the inner Saturn magnetosphere
Gurnett, D. A.; Coates, A. J.; Hospodarsky, G. B. +3 more
Plasma waves observed in the Saturn magnetosphere provide an indication of the plasma population present in the rotationally dominated inner magnetosphere. Electrostatic cyclotron emissions often with harmonics and whistler mode emission are a common feature of Saturn's inner magnetosphere. The electron observations for a region near 5 RS
Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004
Lester, M.; Dunlop, M. W.; Taylor, M. G. G. T. +7 more
While the Cluster spacecraft were located near the high-latitude magnetopause, between 11:30-13:00 UT on 1 April 2004, a series of medium to large scale (40 nT, 0.6-1.2 Re) FTEs were observed. During this pass, simultaneous and conjugated SuperDARN measurements are available that show a global flow pattern which is consistent with the expected (ma…
Cluster observations of particle acceleration up to supra-thermal energies in the cusp region related to low-frequency wave activity - possible implications for the substorm initiation process
Dandouras, I.; Zhang, H.; Zong, Q. -G. +6 more
The purpose of our study is to investigate the way particles are accelerated up to supra-thermal energies in the cusp diamagnetic cavities. For this reason we have examined a number of Cluster cusp crossings, originally identified by Zhang et al. (2005), for the years 2001 and 2002 using data from RAPID, STAFF, EFW, CIS, PEACE, and FGM experiments…
Magnetic reconnection processes induced by a CME expansion
Romoli, M.; Bemporad, A.; Landini, F. +1 more
On 10 11 December 2005 a slow CME occurred in the Western Hemisphere in between two coronal streamers. SOHO/MDI magnetograms show a multipolar magnetic configuration at the photosphere: a complex of active regions located at the CME source and two bipoles at the base of the lateral coronal streamers. White light observations reveal that the CME ex…
Diagnostic of the temperature and differential emission measure (DEM) based on Hinode/XRT data
Siarkowski, M.; Falewicz, R.; Rudawy, P. +1 more
We discuss here various methodologies and an optimal strategy of the temperature and emission measure diagnostics based on Hinode X-Ray Telescope data. As an example of our results we present the determination of the temperature distribution of the X-rays emitting plasma using a filters ratio method and three various methods of the calculation of …
Cluster observations on the thin current sheet in the magnetotail
Dandouras, I.; Rème, H.; Cao, J. B. +3 more
A magnetotail event on 15 September 2001 is analyzed, during which the Cluster spacecraft observed both embedding and bifurcation of the Thin Current Sheet (TCS). It is indicated that the ion anisotropy and nongyrotropy are responsible for those new equilibrium features that represent deviations from the conventional Harris model. Measurements sho…