A macroscopic / microscopic view of a substorm

Details A macroscopic / microscopic view of a substorm A macroscopic / microscopic view of a substorm

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22d..02e&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22D-02

Physics

2744 Magnetotail, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

In this paper we study a plasma sheet thinning event which took place on 11th August 2002, while CLUSTER was located in the nightside, northern hemisphere of the magnetosphere in the plasma sheet/plasma sheet boundary layer. This event took place during a period of quite low Dst but high AE, with substorm signatures observed by ground based measurements and the Los Alamos instruments aboard geosynchronous spacecraft coincident with the plasma sheet thinning observed by both CLUSTER and POLAR. Just prior to the plasma sheet thinning and entrance into the lobe, the CLUSTER tetrahedron observed a tailward moving travelling compression region, as identified by magnetic field measurements from the FGM (Flux Gate Magnetometer) instrument. At this time the IES/RAPID (Imaging Electron Spectrometer/Research with Adaptive Particle Imaging Detectors) and PEACE (Plasma Electron and Current Experiment) instruments on CLUSTER 3 observved a highly collimated field aligned electron beam. By combining groundbased and multi-point spacebased (magnetospheric and up-stream) observations we are able to construct a detailed macroscopic picture of the evolution of this substorm as well as a more microscopic description of the local phenomena at CLUSTER. We study the possible relationship of the beam to reconnection separatrix formation and evolution.

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