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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…
Coordinated studies of the geospace environment using Cluster, satellite and ground-based data: an interim review
Wild, J. A.; Lester, M.; Nakamura, R. +10 more
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind - magnetosphere - ionosphere system. This is mostly due to its ability, for the first time, to provide instantaneous spatial views of structures in the syst…
Poloidal ULF oscillations in the dayside magnetosphere: a Cluster study
Glassmeier, K. -H.; Blomberg, L. G.; Eriksson, P. T. I. +1 more
Three ULF wave events, all occurring in the dayside magnetopshere during magnetically quiet times, are studied using the Cluster satellites. The multi-point measurements obtained from Cluster are used to determine the azimuthal wave number for the events by means of the phase shift and the azimuthal separation between the satellites. Also, the pol…
Polar heating in Saturn's thermosphere
Müller-Wodarg, I. C. F.; Miller, S.; Smith, C. G. A. +1 more
A 3-D numerical global circulation model of the Kronian thermosphere has been used to investigate the influence of polar heating. The distributions of temperature and winds resulting from a general heat source in the polar regions are described. We show that both the total energy input and its vertical distribution are important to the resulting t…
The STAFF-DWP wave instrument on the DSP equatorial spacecraft: description and first results
Belmont, G.; Bouzid, V.; Santolík, O. +13 more
The STAFF-DWP wave instrument on board the equatorial spacecraft (TC1) of the Double Star Project consists of a combination of 2 instruments which are a heritage of the Cluster mission: the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment and the Digital Wave-Processing experiment (DWP). On DSP-TC1 STAFF consists of a three-axis s…