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Improved concept to explain the near-Earth and ground-based magnetic signature of magnetospheric substorms

Authors
/persons/resource/pritter

Ritter,  Patricia
2.3 Earth's Magnetic Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hluehr

Lühr,  Hermann
2.3 Earth's Magnetic Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Ritter, P., Lühr, H. (2008): Improved concept to explain the near-Earth and ground-based magnetic signature of magnetospheric substorms, 37th COSPAR Scientific Assembly (Montreal 2008) (Montreal).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_237976
Abstract
Based on a comprehensive catalogue with more than 4000 substorm entries from the years 2000–2005, the spatial distribution of the substorm-related magnetic signature at mid and low latitudes around local midnight is investigated. For the first time, the magnetic signature of the substorm current wedge formation is studied also in near-Earth satellite data from CHAMP. The average maximal deflection measured on board the satellite is smaller by a factor of 2 than that determined from ground observations. The near-Earth and ground-based magnetic field observations cannot be described adequately by a simple current wedge model. A satisfactory agreement between model results and observations at satellite height and on ground can be achieved only if the current reconfiguration scenario combines the following three elements: the substorm current wedge circuit, tail lobe magnetic field variations and shielding.