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ANNEXE E 2014 Article 4Darrouzet, F., De Keyser, J., Décréau, P. M. E., Lemaire, J. F., et Dunlop, M. W.Spatial gradients in the plasmasphere from ClusterGeophys. Res. Lett., 33, L08105, doi:10.1029/2006GL025727, 2006bGEOPHYSICAL RESEARCH LETTERS, VOL. 33, L08105, doi:10.1029/2006GL025727, 2006Spatial gradients in the plasmasphere from Cluster1 1 2 1 3F. Darrouzet, J. De Keyser, P. M. E. De´cre´au, J. F. Lemaire, and M. W. DunlopReceived 10 January 2006; revised 15 February 2006; accepted 17 March 2006; published 26 April 2006.[1] The Cluster mission allows the study of the gradient of a scalar quantity. Except from computingplasmasphere with four-point measurements, including its derivatives of the magnetic field components to obtainoverall density distribution, plasmaspheric plumes close to curl(B) and div(B), in order to deduce electric currentthe plasmapause, and density irregularities inside the density [Vallat et al., 2005; Dunlop et al., 2006], no scalarplasmasphere. The purpose of this letter is to examine the gradient has been systematically computed yet, mainlygeometryandorientationoftheoveralldensitystructureand because of calibration issues. This work analyzes a caseof the magnetic field. We present a typical Cluster study in depth, as a first step to improve this situation. Afterplasmasphere crossing for which we compute the four- introducing the data set and the analysis technique inpoint spatial gradient of the electron density and the ...