Propagation and motion of bubbles in the geomagnetotail

Details Propagation and motion of bubbles in the geomagnetotail Propagation and motion of bubbles in the geomagnetotail

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh11b..06w&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH11B-06

Other

2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 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 the 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 parallelized and refined 3D MHD simulation model. This new model helps us to achieve a much higher resolution than the previous study, which allows a better exploration of the bubble structures and their evolution. We give a description of detailed 3D bubble structures at different phases of bubble evolution, and find complex patterns across and along the bubble. 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.

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