Sample plasma parameter data measured by the THEMIS-C probe (V. Angelopoulos 2011). Here, t_f is the time of the full Moon (2013-01-27 at 04:30 UTC). The vertical lines separate different regions: SW, MSH, MS. Note that the magnitude of the ion velocity in the DSL coordinate has been used as a proxy for the bulk SW speed. Protons inside MSH and MS are assumed to enter the plasma sheath at the Bohm speed. Hence, V_DSL in this region is not considered.