A case study of high speed flow of high density

Combining with ARTEMIS (P1 and P2) and Wind data, we have investigated the magnetic field and plasma properties in the distant magnetotail during the period January to December 2012. Of particular interest is their characteristic of density near the neutral sheet. We present the discovery of high speed flow of high density in the distant tail under the northward interplanetary magnetic field (IMF) conditions. Multi-satellite observations can present the tailward high speed flow accompany with high density plasma when the satellites were crossing the neutral sheet in the north of the ecliptic plane under the active interplanetary condition. And in this case, single satellite observation shows that the earthward high speed flow accompany with high density plasma because of the influence of solar wind dynamic pressure. And the other satellite observed the tailward high speed flow due to solar wind entry into the magnetotail.