Temperture anisotropy effect on the tearing mode

Details Temperture anisotropy effect on the tearing mode Temperture anisotropy effect on the tearing mode

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1433h&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1433

Physics

0639 Nonlinear Electromagnetics, 0644 Numerical Methods, 7807 Charged Particle Motion And Acceleration, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

Previous study of the Plasma temperature anisotropy in the current sheet have shown that αj > 1 (αj = Tj,perp/Tj,para , j = ion or electron) significantly enhances the growth rate of tearing instability (TI), and the maximum growth wave length shift for shorter by the linear theory [Chen & Palmadesso, Phys. Fluds 1984; Ambrosiano, Geophys. Res. 1986]. Recent result of the two-dimensional (2- D) particle-in cell simulation with M=100 (M: ion to electron mass ratio) have demonstrated that presence of αe efficiently boost up the reconnection flux in the linear phase [Karimabadi et al. 2004]. In contrast, Tanaka [et, al, 2004] have revealed a critical thickness D&cr above which no significant reconnection takes place by 2-D PIC isotopic simulation. Those results lead to some questions. 1. Does αj really enable to take place reconnection with D > Dcr? (D: the initial current sheet thickness) 2. Is α&&j still effective in the nonlinear phase as well as linear phase ? 3. Does αj finally bring the sufficient development of the reconnection ? In order to clarify those questions, we have systematically investigated the effects of αi and αe on TI using 2-D PIC simulation varying M and D. The results are as follows 1. While αe boosts up the growth rate of the shorter wavelengths in the early time, it dose not bring a sufficient development of the reconnection at D > Dcr in the nonlinear phase for M >= 100 [Haijima et al. 2006]. 2. In contrast, αi boosts up the growth rate develop and contributes to sufficient development of the reconnection at D > Dcr even for M = 100. 3. A characteristic fastest growing wavelength is found in the early time for each αj In this presentation, we will make a comparison between the effect of αi and αe on TI

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