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Plasma structures inside boundary layers of magnetic clouds

机译：磁云边界层内部的等离子体结构

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摘要

We analyze the plasma structures for 50 magnetic cloud boundary layers (BLS) which were observed by the spacecraft from February, 1995 to Jane 2003. Main discoveries are: ( i ) The BL is a non-pressure balanced structure, its total pressure, P_(T,L), (the thermal pressure, F_(th, L); plus the magnetic pressure, pm,l) is generally less than the total pressure FTiS and PT.C of the front solar wind (SW) and the following magnetic clouds (MC), respectively. The rising of the P_(th, L) inside the BLS is often not enough to compensate the declining of P_(M,L), (ii) The ratio of electron and proton temperatures, (T_c/T_p)_L, inside the BLS is often less than (T_eT_p)_s and (T_e/T_pp)_c in the SW and the MC, respectively, be-cause the heating of proton is more obvious than that of electron; and (iii) The reversal jet is observed in 80 percent BLS investigated, in which the reversal jets from all of three directions ( + - V_x, + - V_y, + - V_z), were observed in approx = 25 percent BLS. These basic characteristics could be associated with a possible magnetic reconnection process inside the BLS. The results above suggest that the cloud BL owns the plasma structures different from those in the SW and MC. It is a manifestation for the existing significant dynamic interaction between the magnetic cloud and the solar wind.
机译：我们分析了航天器从1995年2月到Jane 2003年观测到的50个磁云边界层（BLS）的等离子体结构。主要发现是：（i）BL是非压力平衡结构，其总压力P_ （T，L）（热压F_（th，L）;加上磁压pm，l）通常小于前太阳风（SW）及其以下的总压力FTiS和PT.C磁云（MC）。 BLS内部的P_（th，L）的升高通常不足以补偿P_（M，L）的下降，（ii）BLS内部的电子与质子温度之比（T_c / T_p）_L在SW和MC中通常分别小于（T_eT_p）_s和（T_e / T_pp）_c，因为质子的加热比电子的加热更明显; （iii）在研究的80％BLS中观察到了反向喷流，其中三个方向（+-V_x，+-V_y，+-V_z）的反向喷流在大约= 25％BLS中观察到。这些基本特征可能与BLS内部可能的磁重新连接过程有关。上面的结果表明云BL拥有与SW和MC不同的等离子体结构。这是磁云与太阳风之间现有的重大动态相互作用的体现。

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