Auroral electrojet configuration during substorm growth phase

Details Auroral electrojet configuration during substorm growth phase Auroral electrojet configuration during substorm growth phase

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rssc3g&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. SSC 3-1, CiteID 1927, DOI 10.1029/2003GL017851

Physics

4

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Current Systems (2409), Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

The spatial configuration of the auroral electrojets during the growth phase of classical substorms is investigated. Electrojet intensities are determined from measurements of the convection electric field and calculated height integrated conductivity. Both the westward and eastward electrojets decrease in latitudinal width towards ~21-23 MLT where they both are terminated. The latitudinal widths of the eastward electrojet as a function of MLT, however, show significant scatter. This scatter is shown to be effectively minimized by organizing the data by the local time distance to the future optical onset location rather than using magnetic local time. We find that the future optical onset will be located in the region of overlapping eastward and westward electrojets. The fact that the future onset location better organizes the data suggests that during the growth phase the magnetosphere is organizing itself for an onset at an already determined MLT as seen at ionospheric altitudes. Neither the IMF By nor IMF clockangle provide a simple explanation of the variation in the onset location.

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