Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31a1684c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31A-1684
Other
2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 7839 Nonlinear Phenomena (4400, 6944), 7924 Forecasting (2722)
Scientific paper
Three-dimensional PIC (Particle-In-Cell) simulations are used to analyze the dynamics of the terrestrial magnetosphere under the impact of a varying IMF. The distance between the dayside magnetopause subsolar point and the "Earth" center, Rmp , is measured, as the intensity of southward IMF |Bz | is slowly varying. Based on the field topology theory, one analyzes the variation of Rmp as a reference index of the dynamics of this interaction, when IMF |Bz | successively increases and decreases to its original value. Striking results are: (i) as the IMF |Bz | increases above a critical value, the variation of Rmp suddenly changes (so called "bifurcation" process in field topology); (ii) the subsolar point recovers its original location by following different paths as the IMF |Bz | value successively increases (from zero to a maximum fixed value) and decreases (from this maximum to zero) passing through some critical values. These different paths are the signature of an "hysteresis" effect, and are characteristic of the so-called "subcritical-type bifurcation".This hysteresis signature indicates that dissipation processes take place via an energy transfer from the solar wind to the magnetosphere by some irreversible way, which leads to a drastic change in the magnetospheric field topology. New other signatures will be described to evidence this hysteresis effect, which is interpreted herein as a consequence of the magnetic reconnection taking place at the dayside magnetopause.
Cai David
Lembege Bertand
Nishikawa Ken
Tao Wang
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