Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43c..04w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM43C-04
Other
2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling
Scientific paper
Entropy-depleted magnetic flux tubes (bubbles) have been observed not only in the Earth's magnetosphere, but also in the magnetospheres of other planets, including Jupiter and Saturn. The motion and evolution of the bubbles are believed to play a crucial role for magnetotail dynamics and global magnetosphere convection of these systems. Birn et al. [2004] studied the propagation of a bubble in the magnetotail and provided a global picture of bubble evolution and dynamics after it is generated. Based on their study, we make further investigations of the motion and dynamic evolution of bubbles in the magnetotail using newly parallelized and refined 3D MHD simulation model. We give a description of detailed 3D bubble structures at different phases of bubble evolution, and find complex patterns across and along the bubble. Bubble dependence on magnetotail environments, including cross tail magnetic field, are studied. A detailed force analysis shows that difference MHD forces play different roles at different locations and evolution phases of the bubble, which explains the formation of the special bubble structures. Detailed current structures in the bubble and along the bubble surface are studied and 3D field line geometry is shown to help understand the evolution of the bubble. We further analyze the interactions between the bubble and its surroundings and make comparisons between our results and those from previous studies. We also make comparison between our simulation results and observations and confirm the ability of our new model to reproduce major observational features of the bubbles. Some other complex magnetotail structures and dynamics related to bubbles, i.e., reconnection and plasma acceleration, are also studied which help reveal the important role of bubbles in magnetotail dynamics.
Birn Joachim
Hesse Matthias
Raeder Joachim
Wang Yadong
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