• DOI:10.1063/1.4942940
• Corpus ID: 118532383

Visco-resistive plasmoid instability

@article{Comisso2016ViscoresistivePI,
  title={Visco-resistive plasmoid instability},
  author={Luca Comisso and Daniela Grasso},
  journal={Physics of Plasmas},
  year={2016},
  volume={23},
  pages={032111}
}

• L. Comisso, D. Grasso
• Published 29 February 2016
• Physics
• Physics of Plasmas

The plasmoid instability in visco-resistive current sheets is analyzed in both the linear and nonlinear regimes. The linear growth rate and the wavenumber are found to scale as S1/4(1+Pm)−5/8 and S3/8(1+Pm)−3/16 with respect to the Lundquist number S and the magnetic Prandtl number Pm. Furthermore, the linear layer width is shown to scale as S−1/8(1+Pm)1/16. The growth of the plasmoids slows down from an exponential growth to an algebraic growth when they enter into the nonlinear regime. In particular, the time-scale of the nonlinear growth of the plasmoids is found to be τNL∼S−3/16(1+Pm)19/32τA,L. The nonlinear growth of the plasmoids is radically different from the linear one, and it is shown to be essential to understand the global current sheet disruption. It is also discussed how the plasmoid instability enables fast magnetic reconnection in visco-resistive plasmas. In particular, it is shown that the recursive plasmoid formation can trigger a collisionless reconnection regime if S≳Lcs(ϵclk)−1(1+Pm)1...