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Empirical reconstruction and long-duration tracking of the magnetospheric boundary in single- and multi-spacecraft contexts
Owen, C. J.; Roth, M.; Dunlop, M. W. +3 more
The magnetospheric boundary is always moving, making it difficult to establish its structure. This paper presents a novel method for tracking the motion of the boundary, based on in-situ observations of the plasma velocity and of one or more additional observables. This method allows the moving boundary to be followed for extended periods of time …
Cluster observations of bounday layer structure and a flux transfer event near the cusp
Balogh, A.; Fazakerley, A. N.; Kistler, L. M. +6 more
On the 25th January 2002 between 10:00 and 12:00 UT, the four Cluster spacecraft passed through the northern high-latitude cusp, the dayside magnetosphere and into the magnetosheath in a linear formation. In the magnetosphere the PEACE electron spectrometers on the four spacecraft all observed a series of transient bursts of magnetosheath-like pla…
A corrector for spacecraft calculated electron moments
Génot, V.; Fazakerley, A. N.; Schwartz, S. J. +3 more
We present the application of a numerical method to correct electron moments calculated on-board spacecraft from the effects of potential broadening and energy range truncation. Assuming a shape for the natural distribution of the ambient plasma and employing the scalar approximation, the on-board moments can be represented as non-linear integral …
Cluster observation of continuous reconnection at dayside magnetopause in the vicinity of cusp
Balogh, A.; Eastwood, J. P.; Lucek, E. A. +10 more
In this paper, we present a case study of continuous reconnection at the dayside magnetopause observed by the Cluster spacecraft. On 1 April 2003, the four Cluster spacecraft experienced multiple encounters with the Earth's dayside magnetopause under a fairly stable southwestward interplanetary magnetic field (IMF). Accelerated plasma flows, whose…
Spacecraft potential control for Double Star
Escoubet, C. P.; Baumjohann, W.; Zhao, H. +12 more
The spacecraft potential of Double Star TC-1 is positive in large parts of the orbits due to the photo-effect from solar EUV irradiation. These positive potentials typically disturb low energy plasma measurements on board. The potential can be reduced, and thereby the particle measurements improved, by emitting a positive ion beam. This method has…
A statistical study on the correlations between plasma sheet and solar wind based on DSP explorations
Zhang, T. L.; Rème, H.; Liu, Z. X. +3 more
By using the data of two spacecraft, TC-1 and ACE (Advanced Composition Explorer), a statistical study on the correlations between plasma sheet and solar wind has been carried out. The results obtained show that the plasma sheet at geocentric distances of about 9~13.4 Re has an apparent driving relationship with the solar wind. It is found that (1…
Double Star project - master science operations plan
Liu, Z.; Shen, C.
For Double Star Project (DSP) exploration, the scientific operations are very important and essential for achieving its scientific objectives. Two years before the launch of the DSP satellites (TC-1 and TC-2) and during the mission operating phase, the long-term and short-term master science operations plans (MSOP) were produced. MSOP is composed …
Simultaneous Double Star and Cluster FTEs observations on the dawnside flank of the magnetosphere
Balogh, A.; Fazakerley, A. N.; Owen, C. J. +8 more
We present Cluster and Double Star-1 (TC-1) observations from a close magnetic conjunction on 8 May 2004. The five spacecraft were on the dawnside flank of the magnetosphere, with TC-1 located near the equatorial plane and Cluster at higher geographic latitudes in the Southern Hemisphere. TC-1, at its apogee, skimmed the magnetopause for almost 8h…
Observations of lion roars in the magnetosheath by the STAFF/DWP experiment on the Double Star TC-1 spacecraft
Walker, S. N.; Yearby, K. H.; Santolik, O. +5 more
Lion roars are intense, short duration packets of whistler mode waves, observed in the magnetosheath. They are typically seen coincident with the magnetic field minima of mirror mode waves. The orbit of the Double Star TC-1 spacecraft (570 km by 78970 km, inclination at 28.5 degrees) is ideal for observations of lion roars as the spacecraft is in …
Cluster observations and theoretical identification of broadband waves in the auroral region
André, M.; Stenberg, G.; Rème, H. +7 more
Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to t…