Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm22a..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM22A-04
Physics
2744 Magnetotail, 2788 Storms And Substorms, 7835 Magnetic Reconnection
Scientific paper
Global MHD simulations of substorms have shown features of global transitions and magnetic reconnection in the magnetotail is the underlying process for these sudden changes. The LFM global MHD code is used to study the nature of this phenomenon by making use of the extensive data available in the simulations. Reconnection is a non-MHD process and to study the dynamical behavior in the magnetosphere using the MHD code, we construct a parameter marking the non-MHD regions or sites of reconnection. The parallel electric field or parallel resistivity is a parameter suitable for monitoring the development toward magnetic reconnection and global transition in the simulations. The goal is to characterize the spatio-temporal developemnt of the chosen parameter and study its underlying features. The large scale dynamics during substorms reflect self-organization in the magnetosphere and the accompanying multiscale properties are indicative of critical behavior. We study the spatio-temporal structure of the parallel resistivity in a global MHD simulation of an idealized case driven by the solar wind with a sudden change of the magnetic field direction from northward to southward. It turns out that the color map of the parallel resistivity in the equatorial plane has the distinct patchy structure which can be considered as a first sign of multiscale behavior. It is also found that the spatio-temporal structure of the parallel resistivity or diffusion coefficient is very similar to that observed in simplified one-dimensional field reversal models. Both spatial and temporal spectra reveal power law dependence characteristic of criticality.
Goodrich Charles Carson
Merkine V. G.
Papadopoulos Konstantinos
Shao Xiaofeng
Sharma Surjalal A.
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