Rice Convection Model Simulation of Injection of an Observed Plasma Bubble Into the Inner Magnetosphere

Details Rice Convection Model Simulation of Injection of an Observed Plasma Bubble Into the Inner Magnetosphere Rice Convection Model Simulation of Injection of an Observed Plasma Bubble Into the Inner Magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13b..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13B-04

Physics

2411 Electric Fields (2712), 2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

An RCM simulation has been carried out for the growth and early expansion phase of a substorm that occurred on July 22, 1998. This is the first substorm simulation for which the RCM boundary conditions and the inputted magnetic field model have been carefully tailored for consistency with measurements made in the inner plasma sheet during the event (Geotail near X=-9, Y=0 in GSM coordinates). The simulation focuses on the injection into the inner magnetosphere of a bubble (region with low specific entropy) that was observed by Geotail. Potential and inductive contributions to the magnetospheric electric field are both important, and their patterns are compared and discussed. One preliminary conclusion from the simulation is that the bubble drifts in a channel that narrows as it approaches the inner magnetosphere, which results in a plasma-sheet inner edge that resembles the injection boundary proposed many years ago by Carl McIlwain. The corresponding distinctive pattern in the auroral electric field is compared with published substorm observations. The model also predicts a distinctive substorm-onset-associated prompt-penetration electric field in the low- and mid-latitude ionosphere.

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