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Electric field scales at quasi-perpendicular shocks

Abstract : This paper investigates the short scale structures that are observed in the electric field during crossings of the quasi-perpendicular bow shock using data from the Cluster satellites. These structures exhibit large amplitudes, as high as 70 m Vm-1 and so make a significant contribution to the overall change in potential at the shock front. It is shown that the scale size of these short-lived electric field structures is of the order of a few c/?pe. The relationships between the scale size and the upstream Mach number and ?Bn are studied. It is found that the scale size of these structures decreases with increasing plasma ? and as ?Bn?90°. The amplitude of the spikes remains fairly constant with increasing Ma and appears to increase as ?Bn?90°.
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Submitted on : Wednesday, July 14, 2004 - 8:00:00 AM
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  • HAL Id : hal-00317475, version 1




S. N. Walker, H. St. C. K. Alleyne, M. A. Balikhin, M. André, T. S. Horbury. Electric field scales at quasi-perpendicular shocks. Annales Geophysicae, European Geosciences Union, 2004, 22 (7), pp.2291-2300. ⟨hal-00317475⟩



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