A multi-point and multi-instrument characterisation of the formation and evolution of the substorm current wedge

Details A multi-point and multi-instrument characterisation of the formation and evolution of the substorm current wedge A multi-point and multi-instrument characterisation of the formation and evolution of the substorm current wedge

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm54a..04m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM54A-04

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2790] Magnetospheric Physics / Substorms

Scientific paper

The formation of the substorm current wedge (SCW) is an integral part of the substorm expansion phase. In general the SCW is viewed as an equivalent current system composed of net downward field aligned current (FAC) in the east, a westward electrojet and net upward field aligned current in the west; however, with increased coverage of the night-side magnetosphere a more detailed and three-dimensional view of the formation and development of the SCW can be achieved. Utilising in-situ observations from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) and the Geosynchronous Operational Environmental Satellites (GOES), as well as ground-based magnetometer, all sky imagers (ASIs) and meridian scanning photometer (MSP) observations (from CARSIMA, THEMIS, CANMOS, GIMA and NORSTAR arrays) we present a detailed spatial and temporal analysis of the magnetic perturbations observed in both the magnetosphere and ionosphere and the auroral forms observed during isolated substorms in order to characterise the development of the substorm expansion phase current system. A complete characterisation of how the SCW forms is key to understanding the physical process in the near-Earth magnetosphere during substorm onset and ultimately how substorms couple to the inner magnetosphere.

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