Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0584l&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0584
Physics
2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2764 Plasma Sheet
Scientific paper
Perhaps the most widely--accepted aspect of magnetospheric substorms is that onset begins with the brightening of a pre--existing auroral arc. The presence of this arc during a substorm growth phase implies that a region with enhanced coupling between the magnetosphere and ionosphere exists before onset. In fact, a growth--phase arc invariably marks the region where onset will occur and basically, it can act as a predictor of at least the location of an impending substorm. Stated somewhat differently, the properties and context of a growth--phase arc form an important part of the initial conditions for substorm onset, leading to the question ``why do substorms preferentially release energy along field lines that map to these arcs''? Previous studies examined the nature of these arcs and have shown that they are typically stationary and that the associated electron precipitation energy flux increases gradually. In this study, we investigate the relationship of growth--phase arcs to ionospheric currents on both small and large scales and discuss the arcs in relation to region 1,2 currents as well as the substorm current wedge.
Carlson Carl W.
Connors Martin G.
Lessard Marc R.
Lotko William
Peria W. J.
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