Modeling Sudden Impulse Events in the High Latitude Ionosphere

Details Modeling Sudden Impulse Events in the High Latitude Ionosphere Modeling Sudden Impulse Events in the High Latitude Ionosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0269h&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0269

Physics

Plasma Physics

7800 Space Plasma Physics, 7900 Space Weather, 7959 Models

Scientific paper

Sudden changes in dynamic solar wind pressure lead to dramatic changes in the structure of the Earth's magnetosphere. One class of these events, known as sudden impulses (SI), leads to the formation of large-scale, field-aligned currents with spatial scales on the order of 1000 km that couple to and close in the ionosphere. The relative simplicity of these events provides a unique opportunity to study the large-scale current systems associated with the coupling between the solar wind, magnetosphere, and ionosphere systems. Using combined ground-based SuperDARN radar and magnetometer observations, we have developed a model of the SI-driven current system as a series of thin current sheets. With computer simulations of the model and a case study event, we show that this model can accurately reproduce the ground signature observed by magnetometers and the ionospheric electric field observed by SuperDARN radars during a particular SI event. By applying this model to a number of distinct SI events it is then possible to determine an empirical relationship between the size of the solar pressure discontinuity and the strength of the SI current system.

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