Tearing mode with guide field gradient in electron magnetohydrodynamics

Huishan Cai; Ding Li
February 2009
Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG
Academic Journal
The tearing mode instability with guide field gradient is investigated in electron magnetohydrodynamics. It is found that the guide field gradient has a significant influence in the inner region. The growth rates are derived analytically in small and large guide field gradient limits, respectively. When the guide field gradient is smaller than the magnetic field shear at the magnetic null plane, the growth rate of tearing mode instability is enhanced by the guide field gradient and has no oscillatory component. When the guide field gradient is larger than the magnetic field shear, the guide field gradient can destabilize tearing mode instability dramatically. In this case, the growth rate is proportional to the guide field gradient.


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