Mar 23, 2006 - ter data we can identify three concentrated generator regions ... allel electric fields, E , accelerate electrons along the mag- netic field. Some of ...
Ann. Geophys., 24, 637–649, 2006 www.ann-geophys.net/24/637/2006/ © European Geosciences Union 2006
Annales Geophysicae
Observations of concentrated generator regions in the nightside magnetosphere by Cluster/FAST conjunctions M. Hamrin1 , O. Marghitu2,3 , K. R¨onnmark1 , B. Klecker3 , M. Andr´e4 , S. Buchert4 , L. M. Kistler5 , J. McFadden6 , H. R`eme7 , and A. Vaivads4 1 Department
of Physics, Ume˚a University, Ume˚a, Sweden for Space Sciences, Bucharest, Romania 3 Max-Planck-Institut f¨ ur extraterrestrische Physik, Garching, Germany 4 Swedish Institute of Space Physics, Uppsala, Sweden 5 Space Science Center, University of New Hampshire, NH, Durham, USA 6 Space Sciences Lab., University of California at Berkley, USA 7 CESR-CNRS, Toulouse, France 2 Institute
Received: 19 April 2005 – Revised: 21 November 2005 – Accepted: 10 January 2006 – Published: 23 March 2006
Abstract. Here and in the companion paper, Marghitu et al. (2006), we investigate plausible auroral generator regions in the nightside auroral magnetosphere. In this article we use magnetically conjugate data from the Cluster and the FAST satellites during a 3.5-h long event from 19–20 September 2001. Cluster is in the Southern Hemisphere close to apogee, where it probes the plasma sheet and lobe at an altitude of about 18 RE . FAST is below the acceleration region at approximately 0.6 RE . Searching for clear signatures of negative power densities, E·J
