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TC-1卫星的观测清晰表明近地磁尾流场的流速随地心距离变化.其中尾向流的流速随地心距离的增加而逐渐增强,并且有从晨昏两侧向夜侧运动的趋势;地向对流的流速随地心距离的下降而逐渐下降,并且有自夜侧向晨昏两侧运动的趋势.尾向流和地向对流在不同等离子体区域的分布有明显不同:在低纬瓣区以尾向流为主;在等离子体片边界层尾向流和对流都较强;在等离子体片内以地向流为主.近地磁尾流场的一个重要特征是尾向流和地向流在11RE附近形成了一个明显的强流分布区域,在此区域地向流和尾向流的流速都较强.强流分布区域的位置和亚暴膨胀相触发区域的位置一致,可能对亚暴膨胀相的触发有重要的影响.另外TC-1卫星的观测显示来自中磁尾的BBF和对流有明显区别.BBF基本上分布在9RE以外,且主要发生在|Z|<3RE区域.
The observation of TC-1 satellite clearly shows that the velocity of the geostrophic wake varies with the distance from the center of the earth, and the velocity of the tail flow increases gradually with the increase of the geocentric distance and tends to move from the twilight to the night. Convective flow rate decreases gradually with the decrease of the geocentric distance, and there is a tendency to move from the night side to the morning and evening side. The distribution of tail flow and ground convection in different plasma regions are obviously different: The main flow in the plasma sheet is tail flow and convection in the boundary layer of the plasma sheet, and the ground flow is mainly in the plasma sheet. An important feature of the near-surface magnetic wake field is that the tail flow and the ground flow are in the 11RE near the formation of a clear area of strong current distribution in the region to the flow and the tail flow velocity are strong.High-flow distribution area and the location of sub-storm expansion phase trigger area may be on the sub-storm expansion In addition, the observation by TC-1 satellite shows that there is a clear difference between the BBF and the convection from the middle magnetite, while the BBF is basically distributed outside the 9RE and mainly occurs in the region of | Z | <3RE.