On the three auroral electrojet system during substorms.

Details On the three auroral electrojet system during substorms. On the three auroral electrojet system during substorms.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52b..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52B-05

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2788 Storms And Substorms

Scientific paper

The behavior of the auroral electrojet indices AU and AL during classical substorms is investigated by the use of global auroral images. A superposition of the 12 AE stations onto global auroral images and identification of the AL and AU contributing stations enable an understanding of the temporal as well as spatial behavior of the indices with respect to the substorm coordinate system and timeframe. Based on this simple technique it was found that at substorm onset the AL contributing station makes a characteristic jump from a location near the dawn terminator to the onset region and that it jumps back to the dawn sector in the early recovery phase. The observations indicate a local minimum in the westward electrojet intensity near midnight, which was confirmed in a case study. The defining AU station does not show any similar systematic behavior. We find that the observations can be explained by the two-component westward electrojet concept and the self-consistent substorm model by Gjerloev and Hoffman [JGR, 2000a&b, 2001, 2002]. These two westward electrojet components are found to be quasi-independent thus resulting in a three electrojet system during substorms.

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