Identification and Decoupling of DP1 and DP2 Current Systems

Details Identification and Decoupling of DP1 and DP2 Current Systems Identification and Decoupling of DP1 and DP2 Current Systems

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm42a..06z&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM42A-06

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Severe controversy about the storm-substorm relationship still exists as shown in recent studies. This is not only because of the complexity of the phenomenon, but also the limitation of measurements from the ground and space. For example, in the high latitude region of the northern hemisphere, magnetometers distributed along the auroral oval are used to create AU, AL and AE indices. Changes in the indices are the manifestation of the auroral electrojet variation contributed by both the near midnight substorm current wedge (also called DP1 current) and the ionospheric Hall current (also called DP2 current). The two current systems have different response to the solar wind and magnetosphere/ionosphere conditions. By studying only these indices, one is unable to determine when the DP1 current system is developed and dominant, as well as unable to elucidate which portion of the electrojet, the DP1 or DP2 current, is more important to the ring current intensification. To clarify this situation, efforts have been put to distinguish and decouple the DP1 and DP2 currents. In this paper we use the method of natural orthogonal components (MNOC) to quantitatively determine DP1 and DP2 separately, and therefore to distinguish high latitude ionospheric current patterns. We have studied the current patterns and DP1/DP2 current densities during magnetic clouds and very disturbed interplanetary magnetic field conditions. Correlations between DP1/DP2 currents and geomagnetic storm intensity have been discussed as well.

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