Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41b06l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM41B-06
Physics
2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2481 Topside Ionosphere, 2704 Auroral Phenomena (2407), 2788 Storms And Substorms
Scientific paper
During substorm growth phases, auroral arcs observed on the ground are known to drift equatorward. This motion is associated with a stretching of the nightside magnetotail as a result of an enhanced transfer of solar wind energy to the magnetosphere. Following the growth phase, substorm onset is marked by the brightening of the most equatorward pre-- existing arc. The importance of the presence of an arc before onset is difficult to exaggerate, since its presence is evidence for a region with enhanced coupling between the magnetosphere and ionosphere that exists before onset. Accordingly, the nature of this arc may determine, to some extent, which physical processes can occur during onset and, likewise, should place constraints on initial conditions for substorm models. In this study, we have identified cases where growth--phase arcs were observed on the ground at Gillam, Manitoba and have used FAST particle and field data to calculate particle and Poynting fluxes associated with these arcs. Results are presented and implications for substorm onset are discussed.
Carlson Carl W.
Lessard Marc R.
Lotko William
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