Paper#: 152
Poster #:
Session Name: Workshop 4C: Waves and Instabilities
Room: 200ABC
Day: Wednesday
Time: 11:15-11:40 a.m.
Abstract Title: Role of the Parallel Current Instability during Substorm: Theory and Observations
PresentSurname: LeContel, O.
All Authors: O. LeContel, R. Pellat, A. Roux, S. Perraut, P. Robert, D. Fontaine, N. Cornilleau-Wehrlin, J.A. Sauvaud, G. Parks, D. Chua, M. Andre, A. Balogh, A. Fazakerley, H. Reme, T. Nagai, T. Mukai, H. Hayakawa, A. Matsuoka
Abstract : A substorm onset is characterized by a very short timescale : few seconds. Therefore low frequency instabilities such as linear tearing or ballooning modes have a too small growth rate to trigger substorms. Thus if we exclude the possibility of a non linear growth of ballooning modes we need to investigate new kind of linear instabilities, with a larger growth rate. We suggest that the parallel current instability could be the instability at the origin of substorm breakup. We give analytical results obtained from a full kinetic approach and compare these results with GEOTAIL and CLUSTER data.