Localized Diamagnetism and Phase Transition in High-Temperature Space Plasma

Details Localized Diamagnetism and Phase Transition in High-Temperature Space Plasma Localized Diamagnetism and Phase Transition in High-Temperature Space Plasma

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11b0439t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11B-0439

Physics

2159 Plasma Waves And Turbulence, 2772 Plasma Waves And Instabilities, 7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena, 7863 Turbulence

Scientific paper

We present two- and three-dimensional strictly collisionless homogeneous full particle numerical simulations with periodic boundary conditions of the formation of localized diamagnetic structures in high temperature plasmas of the kind observed in the magnetosheath and the geomagnetic tail. Such plasmas are in general anisotropic. It is shown that such plasmas spontaneously evolve into a series of localized electron scale magnetic depressions with anticorrelation between the magnetic and plasma pressures while the correlation lengths in both cases are different. The magnetic depression reaches values of 80%. The effect is purely electronic with the ion remaining strictly inert. The depressions are practically two-dimensional having very long extension along the magnetic field lacking any effect of particle trapping by mirror forces. Closer investigation shows that the effect is due to the spontaneous formation of nearly circular electron drift (Hall) currents and is thus purely diamagnetic which is a typical microscopic effect. Such currents form when diamagnetic drift sets on in density fluctuations. Only a small percentage of electrons contributes to these currents. Moreover, the depressed flux tubes arrange in a quasi-crystalline array which is caused by the repulsing forces between neighouring diamagnetic current rings. This resembles second order phase transitions in the Landau-Ginzburg model at very low temperatures which here is working at high plasma temperature.

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