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Multi-spacecraft investigation of space turbulence: Lessons from Cluster and input to the Cross-Scale mission |
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| Authors: | Fouad Sahraoui Melvyn L Goldstein Alain Roux Patrick Canu Nicole Cornilleau-Wehrlin Thierry Dudok De Wit Khurom Kiyani |
| Institution: | a NASA Goddard Space Flight Center, Code 673, Greenbelt, MD 20771, USA b Laboratoire de Physique des Plasmas, CNRS-Ecole Polytechnique, 10-12 Avenue de l’Europe, Vélizy 78140, France c Université Pierre et Marie Curie, Place Jussieu, Paris, France d Laboratoire de Physique et de Chimie de l’Environnement et de L’espace, LPC2E-CNRS, Université d’Orléans, France e Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, UK |
| Abstract: | Investigating space plasma turbulence from single-point measurements is known to be characterized by unavoidable ambiguities in disentangling temporal and spatial variations. Solving this problem has been one of the major goals of the Cluster mission. For that purpose multipoint measurements techniques, such as the k-filtering, have been developed. Such techniques combine several time series recorded simultaneously at different points in space to estimate the corresponding energy density in the wavenumber space. Here we apply the technique to both simulated and Cluster magnetometer data in the solar wind (SW) and investigate the errors and limitations that arise due to the separation of the spacecraft and the quality of the tetrahedral configuration. Specifically, we provide an estimation of the minimum and maximum scales that can be accurately measured given a specific distance between the satellites and show the importance of the geometry of the tetrahedron and the relationship of that geometry to spatial aliasing. We also present recent results on characterizing small scale SW turbulence and provide scientific arguments supporting the need of new magnetometers having better sensitivity than the existing ones. Throughout the paper we emphasize technical challenges and their solutions that can be considered for a better preparation of the Cross-Scale mission. |
| Keywords: | Cluster Turbulence Cross-Scale k-Filtering Solar wind Dissipation |
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