Search Publications
Localized fast flow disturbance observed in the plasma sheet and in the ionosphere
Balogh, A.; Lester, M.; André, M. +8 more
An isolated plasma sheet flow burst took place at 22:02 UT, 1 September 2002, when the Cluster footpoint was located within the area covered by the Magnetometers-Ionospheric Radars-All-sky Cameras Large Experiment (MIRACLE). The event was associated with a clear but weak ionospheric disturbance and took place during a steady southward IMF interval…
Cluster multispacecraft observations at the high-latitude duskside magnetopause: implications for continuous and component magnetic reconnection
Lundin, R.; Balogh, A.; André, M. +13 more
We report multispacecraft Cluster observations of magnetic reconnection at the high-latitude magnetopause/magnetospheric boundary layer (MP/BL) under mainly northward interplanetary magnetic field (IMF) conditions. The event we study is on 3 December 2001 when the Cluster spacecraft were skimming the high-latitude duskside MP/BL during a period of…
First results of low frequency electromagnetic wave detector of TC-2/Double Star program
Zhou, L.; Santolík, O.; Parrot, M. +17 more
LFEW is a low frequency electromagnetic wave detector mounted on TC-2, which can measure the magnetic fluctuation of low frequency electromagnetic waves. The frequency range is 8 Hz to 10 kHz. LFEW comprises a boom-mounted, three-axis search coil magnetometer, a preamplifier and an electronics box that houses a Digital Spectrum Analyzer. LFEW was …
Coordinated Cluster/Double Star observations of dayside reconnection signatures
Escoubet, C. P.; Pitout, F.; Zong, Q. -G. +18 more
The recent launch of the equatorial spacecraft of the Double Star mission, TC-1, has provided an unprecedented opportunity to monitor the southern hemisphere dayside magnetopause boundary layer in conjunction with northern hemisphere observations by the quartet of Cluster spacecraft. We present first results of one such situation where, on 6 April…
Characteristics of the near-tail dawn magnetopause and boundary layer
Klecker, B.; Vaivads, A.; Hasegawa, H. +6 more
The paper discusses properties of the near-tail dawnside and boundary layer, as obtained from Cluster plasma and magnetic field measurements during a single skimming orbit on 4 and 5 July 2001 that included 24 well-defined crossings by all four spacecraft. As a result of variations of the interplanetary magnetic field, the magnetic shear across th…
Modelling cosmic ray intensities along the Ulysses trajectory
Ferreira, S. E. S.; Potgieter, M. S.; Heber, B. +1 more
Time dependent cosmic ray modulation in the inner heliosphere is studied by comparing results from a 2-D, time-dependent cosmic ray transport model with Ulysses observations. A compound approach, which combines the effects of the global changes in the heliospheric magnetic field magnitude with drifts to establish a realistic time-dependence, in th…
Radial variation of whistler-mode chorus: first results from the STAFF/DWP instrument on board the Double Star TC-1 spacecraft
Santolík, O.; Yearby, K. H.; Cornilleau-Wehrlin, N. +2 more
We use the first measurements of the STAFF/DWP instrument on the Double Star TC-1 spacecraft to investigate whistler-mode chorus. We present initial results of a systematic study on radial variation of dawn chorus. The chorus events show an increased intensity at L parameter above 6. This is important for the possible explanation of intensificatio…
Dawn-dusk asymmetries and sub-Alfvénic flow in the high and low latitude magnetosheath
Dandouras, I.; Fazakerley, A. N.; Lucek, E. A. +4 more
We present the results of a statistical survey of the magnetosheath using four years of Cluster orbital coverage. Moments of the plasma distribution obtained from the electron and ion instruments together with magnetic field data are used to characterise the flow and density in the magnetosheath. We note two important differences between our surve…
Multi-spacecraft determination of wave characteristics near the proton gyrofrequency in high-altitude cusp
Wahlund, J. -E.; André, M.; Stenberg, G. +11 more
We present a detailed study of waves with frequencies near the proton gyrofrequency in the high-altitude cusp for northward IMF as observed by the Cluster spacecraft. Waves in this regime can be important for energization of ions and electrons and for energy transfer between different plasma populations. These waves are present in the entire cusp …
Wave particle interactions in the high-altitude polar cusp: a Cluster case study
Balogh, A.; Lavraud, B.; André, M. +5 more
On 23 March 2002, the four Cluster spacecraft crossed in close configuration (~100 km separation) the high-altitude (10 RE) cusp region. During a large part of the crossing, the STAFF and EFW instruments have detected strong electromagnetic wave activity at low frequencies, especially when intense field-aligned proton fluxes were detect…