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The magnetic field and plasma structures during two successive crossings ofthe subsolar magnetospheric boundary layers (i.e. MagnetoPause Current Layer(MPCL) and Low-Latitude Boundary Layer (LLBL)) under the southward-dawnwardIMF are examined on the basis of the data obtained by the GEOTAIL spacecraft.A significant and interesting feature is found, that is, Flux Transfer Events(FTEs) occur in association with the formation of the tilted X-line. Duringthe first inbound MPCL/LLBL crossing, the ion velocity enhancement (inparticular, the Vl component negatively increases) can be observed inassociation with simultaneous typical bipolar signature (positive followed bynegative) in the Bn component. In addition, a clear D-shaped iondistribution whose origin is the magnetosheath can also be found in thedawnward direction. A few minutes later, the satellite experiences outboundMPCL crossing. The negative enhancement of the Vm component can befound as well as the positive enhancement of the Vl component. Simultaneously,a typical bipolar signature with the polarity (negative followed by positive)opposite that observed in the first encounter can also be observed. The ionsfrom the magnetosheath flow predominantly in the duskward direction, althoughthe D-shaped ion distribution cannot be observed. These results indicate thatthe satellite initially observes one part of a reconnected flux tube formedby FTEs whose magnetospheric side is anchored to the Southern Hemisphere. Theions confined in this partial flux tube are flowing in the south-dawnwarddirection. Then, the satellite observes the other part of the reconnectedflux tube whose magnetospheric side is anchored to the Northern Hemisphere.The ions confined in this flux tube flow dominantly in the north-duskwarddirection. Furthermore, it can be considered that the second MPCL crossing isa direct cut through the diffusion region of FTEs because the LLBL is absentin the vicinity of the MPCL. On the basis of these results, it can be concludedthat the satellite was passing near the tilted X-line.The information obtained through this study is expected to be of great usein discriminating between the anti-parallel (steady-state) reconnection andtilted X-line models on the dayside MPCL

GEOTAIL observation of tilted X-line formation during flux transfer events (FTEs) in the dayside magnetospheric boundary layers