  We study the effects of the Hall electric field on magnetic island
coalescence in the large island limit and find evidence for both a elongated
electron current sheet layer with a Sweet-Parker-like reconnection rate and a
collapsed, Petschek-like electron sheet with a peak reconnection rate
approaching the 0.1 vA B0 Hall MHD rate. The state observed in our simulations
appears to depend on grid scale. Furthermore, even at the largest system sizes,
we find that flux-pileup effects cause the islands to "bounce" despite the
presence of a collapsed current sheet allowing for fast instantaneous
reconnection. The average reconnection rate in the large island limit is slow
though the peak reconnection rate is fast.
