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Magnetic reconnection X-lines have been observed to be more common duskwardof midnight. Thin current sheets have also been postulated to be a necessaryprecondition for reconnection onset. We take advantage of the MMS tetrahedralformation during the 2017--2020 MMS tail seasons to calculate the thickness ofthe cross-tail neutral sheet relative to ion gyroradius. While a similartechnique was applied to Cluster data, current sheet thickness over a broaderrange of radial distances has not been robustly explored before this study. Wecompare this to recent theories regarding mechanisms of tail current sheetthinning and to recent simulations. We find MMS spent more than twice as longin ion-scale thin current sheets in the pre-midnight sector than post-midnight,despite nearly even plasma sheet dwell time. The dawn-dusk asymmetry in thedistribution of Ion Diffusion Regions, as previously reported in relation toregions of thin current sheets, is also analyzed.

Applying Magnetic Curvature to to MMS data to identify thin current sheets relative to tail reconnection