Spatio-temporal Features of Magnetic Storms Inferred From a High-resolution Empirical Magnetic Field Model and Birkeland Current Data

Details Spatio-temporal Features of Magnetic Storms Inferred From a High-resolution Empirical Magnetic Field Model and Birkeland Current Data Spatio-temporal Features of Magnetic Storms Inferred From a High-resolution Empirical Magnetic Field Model and Birkeland Current Data

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm14a..02t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM14A-02

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 7954 Magnetic Storms (2788)

Scientific paper

We report results of empirical modeling of the geomagnetic field and underlying current systems during magnetic storms using the new high-resolution dynamical empirical magnetic field model TS07D and Birkeland current images obtained with the help of the Iridium constellation. Many details of the morphology and dynamics of magnetic storms inferred from the new empirical magnetic field model are found to be consistent with earlier results of the ring current modeling and observations, which form now a coherent picture of the whole phenomenon. New findings include the double partial ring current during the main storm phase and the domination of the tail current over the conventional partial ring current during the second dip of the double-dip storms. The former effect is consistent with Image data and may be an integrated result of the substorm current wedge. Field aligned currents are derived from the TS07D model and show significant distortions of a conventional Birkeland current pattern, when compared with those during conventional single- dip storms. These currents are compared with Birkeland current distributions derived from Iridium magnetometer data which reveal comparable differences in double-dip storms relative to single-dip storms.

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