Search Publications
Magnetopause current as seen by Cluster
Balogh, A.; Dunlop, M. W.
The four-spacecraft, magnetic field measurements on Cluster can be combined to produce an accurate determination of the electric current in the magnetopause boundary during stable magnetopause crossings. For events that are planar on the scale of the spacecraft configuration, the thickness of the current layer can be accurately estimated from its …
Transition from substorm growth to substorm expansion phase as observed with a radial configuration of ISTP and Cluster spacecraft
Sauvaud, J. -A.; Thomsen, M. F.; Klecker, B. +10 more
Transition from the growth phase to the substorm expansion during a well-isolated substorm with a strong growth phase is investigated using a unique radial (THEMIS-like) spacecraft constellation near midnight, including the probing of the tail current at ~16 RE with Cluster, of the transition region at ~9 RE with Geotail and …
Cluster observations of sudden impulses in the magnetotail caused by interplanetary shocks and pressure increases
Balogh, A.; Lucek, E.; Rème, H. +6 more
Sudden impulses (SI) in the tail lobe magnetic field associated with solar wind pressure enhancements are investigated using measurements from Cluster. The magnetic field components during the SIs change in a manner consistent with the assumption that an antisunward moving lateral pressure enhancement compresses the magnetotail axisymmetrically. W…
Double Star TC-1 observations of component reconnection at the dayside magnetopause: a preliminary study
Zhang, T. L.; Dandouras, I.; Zhang, H. +13 more
In spring 2004 Double Star TC-1 measured a number of reconnection signatures at the dayside low-latitude magnetopause (MP) when there was a notable By component in the magnetosheath. In a number of events we can show that reconnection was operating nearby TC-1 in the subsolar MP region. In this paper we describe three representative eve…
The Double Star Plasma Electron and Current Experiment
Kataria, D. O.; Wilson, R. J.; Fazakerley, A. N. +16 more
The Double Star Project is a collaboration between Chinese and European space agencies, in which two Chinese magnetospheric research spacecraft, carrying Chinese and European instruments, have been launched into equatorial (on 29 December 2003) and polar (on 25 July 2004) orbits designed to enable complementary studies with the Cluster spacecraft.…
Temporal and spatial evolution of discrete auroral arcs as seen by Cluster
Nilsson, H.; Karlsson, T.; Fazakerley, A. +7 more
Two event studies are presented in this paper where intense convergent electric fields, with mapped intensities up to 1350 mV/m, are measured in the auroral upward current region by the Cluster spacecraft, at altitudes between 3 and 5 Earth radii. Both events are from May 2003, Southern Hemisphere, with equatorward crossings by the Cluster spacecr…
Survey of energetic O+ ions near the dayside mid-latitude magnetopause with Cluster
Sauvaud, J. -A.; Balogh, A.; Klecker, B. +7 more
Since December 2000, the Cluster satellites have been conducting detailed measurements of the magnetospheric boundaries and have confirmed the unambiguous presence of ions of terrestrial origin (e.g. O+ in regions adjacent to the dayside, mid-latitude magnetopause. In the present paper, we focus on the statistical properties of the O
Statistics of high-altitude and high-latitude O+ ion outflows observed by Cluster/CIS
Lundin, R.; Yamauchi, M.; Nilsson, H. +8 more
The persistent outflows of O+ ions observed by the Cluster CIS/CODIF instrument were studied statistically in the high-altitude (from 3 up to 11 RE) and high-latitude (from 70 to ~90 deg invariant latitude, ILAT) polar region. The principal results are: (1) Outflowing O+ ions with more than 1keV are observed above …
Plasma flow channels with ULF waves observed by Cluster and Double Star
Balogh, A.; Zhang, T. L.; Glassmeier, K. -H. +9 more
On 14 August 2004 a large-scale magnetic structure was observed by Double Star TC-1 in the southern lobe and by Cluster in the northern lobe of the magnetotail. The structure has the signature of a (localized) dipolarization, decreasing Bx accompanied by an increasing Bz and a strong earthward flow. The propagation direction …
Simultaneous in-situ observations of the signatures of dayside reconnection at the high- and low-latitude magnetopause
Balogh, A.; Davies, J. A.; Wild, J. A. +10 more
We present magnetic field and particle data recorded by the Cluster and Geotail satellites in the vicinity of the high- and low-latitude dayside magnetopause, respectively, on 17 February 2003. A favourable conjunction of these spacecraft culminated in the observation of a series of flux transfer events (FTEs), characterised by bipolar perturbatio…