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The Double Star mission
Escoubet, C. P.; Liu, Z. X.; Shen, C. +4 more
The Double Star Programme (DSP) was first proposed by China in March, 1997 at the Fragrant Hill Workshop on Space Science, Beijing, organized by the Chinese Academy of Science. It is the first mission in collaboration between China and ESA. The mission is made of two spacecraft to investigate the magnetospheric global processes and their response …
Propagation of whistler-mode chorus to low altitudes: divergent ray trajectories and ground accessibility
Santolík, O.; Chum, J.
We investigate the ray trajectories of nonductedly propagating lower-band chorus waves with respect to their initial angle θ0, between the wave vector and ambient magnetic field. Although we consider a wide range of initial angles θ0, in order to be consistent with recent satellite observations, we pay special attention to th…
Optimal reconstruction of magnetopause structures from Cluster data
Klecker, B.; Hasegawa, H.; Dunlop, M. W. +3 more
The Grad-Shafranov (GS) reconstruction technique, a single-spacecraft based data analysis method for recovering approximately two-dimensional (2-D) magnetohydrostatic plasma/field structures in space, is improved to become a multi-spacecraft technique that produces a single field map by ingesting data from all four Cluster spacecraft into the calc…
The HIA instrument on board the Tan Ce 1 Double Star near-equatorial spacecraft and its first results
Lundin, R.; Dandouras, I.; Klecker, B. +16 more
On 29 December 2003, the Chinese spacecraft Tan Ce 1 (TC-1), the first component of the Double Star mission, was successfully launched within a low-latitude eccentric orbit. In the framework of the scientific cooperation between the Academy of Sciences of China and ESA, several European instruments, identical to those developed for the Cluster spa…
First current density measurements in the ring current region using simultaneous multi-spacecraft CLUSTER-FGM data
Balogh, A.; Dandouras, I.; Lucek, E. +7 more
The inner magnetosphere's current mapping is one of the key elements for current loop closure inside the entire magnetosphere. A method for directly computing the current is the multi-spacecraft curlometer technique, which is based on the application of Maxwell-Ampère's law. This requires the use of four-point magnetic field high resolution measur…
Double Star/Cluster observation of neutral sheet oscillations on 5 August 2004
Balogh, A.; Zhang, T. L.; Nakamura, R. +8 more
Previous Cluster observations have shown that the flapping motions of the Earth's magnetotail are of internal origin and that kink-like waves are emitted from the central part of the tail and propagate toward the tail flanks. The newly launched Double Star Program (DSP) TC-1 satellite allows us to investigate neutral sheet at 10-13 Re in the tail.…
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…