Comparing Magnetospheric Cross-Field Current Systems In ICME And CIR/HSS Driven Storms

Details Comparing Magnetospheric Cross-Field Current Systems In ICME And CIR/HSS Driven Storms Comparing Magnetospheric Cross-Field Current Systems In ICME And CIR/HSS Driven Storms

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13a1788l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13A-1788

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2753] Magnetospheric Physics / Numerical Modeling, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Cross-field current streamline traces through numerical simulation results of various storm events are presented and discussed. In particular, a comparison of the location and strength of the various near-Earth nightside current systems is made for two events, one driven by an interplanetary coronal mass ejection and another driven by a corotating interaction region/high speed stream. Using results from the Space Weather Modeling Framework, a systematic set of current streamline traces are found from a grid of starting locations in the midnight meridional plane. These current streamlines are then labels according to the current system to which they belong: symmetric ring current, partial ring current, tail current, etc. It is shown that the interpretation of cross-field currents is a difficult task. A single near-tail magnetic field line can be part of a variety of cross field current systems. For example, a field line crossing downtail at R=8 during the main phase of a storm was found to contain partial ring current, symmetric ring current, and tail current simultaneously. Such field lines with multiple currents are common in the near-Earth tail. The occurrence and morphology of the current systems in relation to the magnetic field topology is presented and discussed within the context of two representative ICME and CIR/HSS driven storms.

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