Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh51b..04h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH51B-04
Physics
2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2788 Storms And Substorms
Scientific paper
A large number of ground based magnetometer stations and images are used to investigate a possible separation of the auroral electrojet index AL. Based on the two-component electrojet concept, the AL index is a measure of either the directly driven convection electrojet activity or the substorm current wedge electrojet activity. We presents results of a separation of the auroral electrojet index AL into two parts each monitoring these fundamentally different processes. Classical auroral substorms are selected using global auroral images and case studies as well as statistical results from more than 100 substorms will be presented. The statistical MLT distribution of the AL station location before and after the substorm onset was found by Gjerloev et al. [EOS, SM52B-05, F1179, 2002] to be well separated, thereby enabling a separation of the AL into ALw (wedge) and ALc (convection) using a simple MLT binning. The suggested separation of AL enables a simultaneous monitoring of the two westward electrojet components, thereby improving our ability to specify the space weather conditions as well as increasing our understanding of the temporal variability of these two electrojet components.
Frank Louis A.
Friel M.
Gjerloev Jesper W.
Hoffman Robert A.
Kamei Toyohisa
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