Date: Tuesday, August 7, 2007
Time: 10:30am
Location: NIA, Room 137
Additional Information: Presentation (.pdf)
A Rice Convection Model Study of Depleted Channels in the Storm-Time Plasma Sheet
Jichun Zhang, Rice University
Depleted channels, also called “bubbles”, are due to magnetic reconnection in the magnetotail or other forms of current sheet disruption such as substorm current wedge. In this study, depleted channels are simulated with the Rice Convection Model (RCM) by varying conditions on the model’s tailward boundary with both space and time. The first computational picture of injection of depleted channels into the inner magnetosphere will be presented. It is shown that gradient/curvature drift affects the propagation of depleted channels and the Birkeland currents shape depleted channels in extremely cold and dense plasma. It is found that depleted channels can push the ring current further inward, increase peak particle pressure values, and enhance the ring current, Birkeland currents, and Pedersen currents.
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