University of California at San Diego, La Jolla, California 92093, USA.
Phys Rev Lett. 2011 Jul 8;107(2):025002. doi: 10.1103/PhysRevLett.107.025002. Epub 2011 Jul 6.
Using fully kinetic simulations of the island coalescence problem for a range of system sizes greatly exceeding kinetic scales, the phenomenon of flux pileup in the collisionless regime is demonstrated. While small islands on the scale of λ ≤ 5 ion inertial length (d(i)) coalesce rapidly and do not support significant flux pileup, coalescence of larger islands is characterized by large flux pileup and a weaker time averaged reconnection rate that scales as √(d(i)/λ) while the peak rate remains nearly independent of island size. For the largest islands (λ = 100d(i)), reconnection is bursty and nearly shuts off after the first bounce, reconnecting ~20% of the available flux.
利用对远大于动力学尺度的一系列系统尺寸的岛聚问题的全动力学模拟，演示了无碰撞状态下的通量堆积现象。虽然在λ≤5离子惯性长度（d(i)）尺度上的小岛屿迅速聚合并不支持显著的通量堆积，但较大岛屿的聚合并具有较大的通量堆积和较弱的时间平均重联率，该比率与√(d(i)/λ)成正比，而峰值速率几乎与岛的大小无关。对于最大的岛屿（λ=100d(i)），重联是突发的，在第一次反弹后几乎关闭，重新连接约 20%的可用通量。
