Abstract
Influence of the guide field on quick magnetic reconnection triggering (QMRT) is investigated by three‐dimensional (3‐D) full‐particle simulations with the mass ratio of 400. Here two runs with different current sheet thickness (D = 0.35 and 0.5, D: the current sheet half thickness normalized by the ion inertial length) are performed with a constant guide field of B0y = 0.75B0x (B0x: asymptotic magnitude of reconnecting component). QMRT has been found in a null guide‐field case of D = 0.5 ∼ 0.875 and is quick because reconnection onset is directly coupled to the most quickly growing mode in the system, the lower‐hybrid drift instability (LHDI) ( I. Shinohara and M. Fujimoto, Quick triggering of magnetic reconnection in an ion‐scale current sheet, submitted to PhysicalReviewLetters, 2004, hereinafter referred to as Shinohara and Fujimoto, submitted manuscript, 2004). In contrast D = 0.5 with B0y = 0.75B0x is too thick to be subject to QMRT. Recovery of QMRT is found at D = 0.35, accompanying a single X‐line formation with slight delay from the LHDI saturation.
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