Results 1 to 10 of about 30,979 (263)
Active spacecraft potential control for Cluster – implementation and first results [PDF]
Annales Geophysicae, 2001 Electrostatic charging of a spacecraft modifies the distribution of electrons and ions before the particles enter the sensors mounted on the spacecraft body. The floating potential of magnetospheric satellites in sunlight very often reaches several
K. Torkar +18 more
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Cluster PEACE observations of electrons of spacecraft origin [PDF]
Annales Geophysicae, 2001 The two PEACE (Plasma Electron And Current Experiment) sensors on board each Cluster spacecraft sample the electron velocity distribution across the full 4<pi> solid angle and the energy range 0.7 eV to 26 keV with a time resolution of 4 s ...
S. Szita +9 more
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Anisotropic Turbulent Spectra in the Terrestrial Magnetosheath as Seen by the Cluster Spacecraft [PDF]
Physical Review Letters, 2006 Here we report the first three-dimensional spatial spectrum of the low frequency magnetic turbulence obtained from the four Cluster spacecraft in the terrestrial magnetosheath close to the magnetopause. We show that the turbulence is compressible and dominated by mirror structures, its energy is injected at a large scale kp approximately 0.3 (l ...
F. Sahraoui +5 more
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DECENTRALIZED PACKET TASK ALLOCATION FOR SPARS CLUSTER OF SPACECRAFT
Information systems, mechanics and control, 2016 Рассматривается задача децентрализованного распределения целевых задач для разреженного кластера космических аппаратов, выполняемого в виде пакетов для каждого космического аппарата. Предложен усовершенствованный метод, рассматривающий такой кластер как мультиагентную систему и обеспечивающий хорошую сходимость, а также получение приемлемого результата
Александр Геннадиевич Меланченко +1 more
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Detection of a plasmaspheric wind in the Earth's magnetosphere by the Cluster spacecraft [PDF]
Annales Geophysicae, 2013 Abstract. Plumes, forming at the plasmapause and released outwards, constitute a well-established mode for plasmaspheric material release to the Earth's magnetosphere. They are associated to active periods and the related electric field change. In 1992, Lemaire and Shunk proposed the existence of an additional mode for plasmaspheric material release to
I. Dandouras
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Kernel Embedding Approaches to Orbit Determination of Spacecraft Clusters [PDF]
, 2018 This paper presents a novel formulation and solution of orbit determination over finite time horizons as a learning problem. We present an approach to orbit determination under very broad conditions that are satisfied for n-body problems. These weak conditions allow us to perform orbit determination with noisy and highly non-linear observations such as
Srinagesh Sharma, James Cutler
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Methods of Orbit Clustering of Serviced Spacecraft
System technologies, 2019 When planning orbital service operations, it is important to rationally divide a set of orbits serviced by a spacecraft into subsets (clusters) of orbits. This article proposes a technique for clustering the orbits of serviced spacecraft in the event of their servicing by a reusable service spacecraft with an electric rocket low thrust engine.
Anatolii Petrovych Alpatov +1 more
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An initial investigation of the long-term trends in the fluxgate magnetometer (FGM) calibration parameters on the four Cluster spacecraft [PDF]
Geoscientific Instrumentation, Methods and Data Systems, 2014 Over the course of more than 10 years in operation, the calibration parameters of the outboard fluxgate magnetometer (FGM) sensors on the four Cluster spacecraft are shown to be remarkably stable.
L. N. S. Alconcel +5 more
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High altitude ion heating observed by the Cluster spacecraft
, 2011 This thesis deals with heating of outowing oxygen ions at high altitude above the polar cap using data from the Cluster spacecraft. oInospheric plasma may flow up from the ionosphere but at velocities which are low enough that the ions are still gravitationally bound. For the ions to overcome gravity, further acceleration is needed.
M. Waara
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Artificial spacecraft in hybrid simulations of the quasi-parallel Earth's bow shock: analysis of time series versus spatial profiles and a separation strategy for Cluster [PDF]
Annales Geophysicae, 1994 We construct artificial "software" spacecraft consisting of magnetometers and 3D thermal and energetic ion detectors. Four such spacecraft are "flown" through a 1D simulation of a quasi-parallel shock. We analyze the resulting time
J. Giacalone, S. J. Schwartz, D. Burgess
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