已有研究发现金星磁尾的太阳风氢离子(H+)和金星电离层氧离子(O+)存在大尺度涡流结构,该涡流从磁尾望向星球是逆时针的.为了确定该涡流的存在性,利用金星快车等离子体和高能原子分析仪(Analyzer of Space Plasmas and Energetic Atoms on Venus,ASPERA-4)的Fedorov矫正数据,分别在金星公转轨道坐标系(VSO)和太阳风电场坐标系(VSE)下对磁尾等离子体流进行了统计分析.结果显示,在VSO和VSE坐标系中都存在太阳风H+和金星O+的顺时针涡流结构.但是从已有的研究结果看,无论等离子体涡流是逆时针还是顺时针,其产生的磁场都与已知磁尾磁场结构不相符;考虑到金星和火星空间环境的相似性及火星磁尾太阳风H+并不存在完整等离子体涡流的情况,认为金星磁尾可能并不存在大尺度等离子体涡流.金星的等离子体特征需要未来更多卫星观测研究.
Large-scale Plasma Vortex in the Magnetotail of Venus
Using the observations by the Analyzer of Space Plasmas and Energetic Atoms on Venus(ASPERA-4)onboard Venus Express,Previous studies found A large-scale plasma vortices of solar wind hydrogen ions(H+)and Venus ionospheric oxygen ions(O+)in the magnetotail of Venus.The vortex is counterclockwise when viewed from the tail towards the planet.We conducted a statistical analysis of the ASPERA-4 moment data calibrated by Fedorov to investigate the plasma characteristics in Venu-sian magnetotail.The statistical results showed that there are large-scale vortices of the solar wind H+and Venus ionospheric O+in both the Venus-Solar-Orbital(VSO)and Venus-Solar-Electrical(VSE)co-ordinate systems,but there are clockwise.Considering that neither counterclockwise nor clockwise plas-ma vortices can generate a magnetic field consistent with the observed magnetic structure in the Venu-sian magnetotail,and no complete plasma vortex is observed in the Mars magnetotail with a magnetic structure similar to that of Venusian magnetotail,concluded that there may not be large-scale plasma vortices in the Venusian magnetotail,and that more satellite observations are needed in the future to in-vestigate the plasma characteristics on Venus.
MagnetotailPlasma vortexMagnetic field structureVenusMars
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