Properties of plasmoid-dominated turbulent reconnection in a low- \beta background plasma are investigated by resistive magnetohydrodynamic ( MHD ) simulations .
In the \beta _ { in } < 1 regime , where \beta _ { in } is plasma \beta in the inflow region , the reconnection site is dominated by shocks and shock-related structures and plasma compression is significant .
The effective reconnection rate increases from 0.01 to 0.02 as \beta _ { in } decreases .
We hypothesize that plasma compression allows faster reconnection rate , and then we estimate a speed-up factor , based on a compressible MHD theory .
We validate our prediction by a series of MHD simulations .
These results suggest that the plasmoid-dominated reconnection can be twice faster than expected in the \beta \ll 1 environment in a solar corona .