Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
Ann. Geophys., 25, 1025-1035, 2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
08 May 2007
Global and local disturbances in the magnetotail during reconnection
T. V. Laitinen1, R. Nakamura2, A. Runov2, H. Rème3, and E. A. Lucek4 1Finnish Meteorological Institute, Space Research, PL 503, 00101 Helsinki, Finland
2Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria
3Centre d'Etude Spatiale des Rayonnements, Toulouse, France
4The Blackett Laboratory, Imperial College, London, UK
Abstract. We examine Cluster observations of a reconnection event at xGSM=−15.7 RE in the magnetotail on 11 October 2001, when Cluster recorded the current sheet for an extended period including the entire duration of the reconnection event. The onset of reconnection is associated with a sudden orientation change of the ambient magnetic field, which is also observed simultaneously by Goes-8 at geostationary orbit. Current sheet oscillations are observed both before reconnection and during it. The speed of the flapping motions is found to increase when the current sheet undergoes the transition from quiet to active state, as suggested by an earlier statistical result and now confirmed within one single event. Within the diffusion region both the tailward and earthward parts of the quadrupolar magnetic Hall structure are recorded as an x-line passes Cluster. We report the first observations of the Hall structure conforming to the kinks in the current sheet. This results in relatively strong fluctuations in Bz, which are shown to be the Hall signature tilted in the yz plane with the current sheet.

Citation: Laitinen, T. V., Nakamura, R., Runov, A., Rème, H., and Lucek, E. A.: Global and local disturbances in the magnetotail during reconnection, Ann. Geophys., 25, 1025-1035,, 2007.
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