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磁暴主相期间对流电场驱动等离子体片中的能量粒子经历E×B漂移,被地磁场俘获形成环电流,在此理论基础上充分考虑电荷交换造成的环电流损失与离子沉降的影响,改善并验证了磁暴主相期间环电流离子分布模式.模拟了不同强度磁暴主相期间磁层环电流离子的分布特征,研究了部分环电流离子对对流电场的响应.结果表明:不对称的环电流是磁暴主相期间环电流的重要组成部分,其分布特性表现为晨昏不对称和日夜不对称以及离子投掷角分布的各向异性等.对流电场与能量离子通量强度和分布范围之间正相关.模拟结果与观测有很好的一致性,证明了模型的可行性.
During the main phase of the storms, the energy particles in the plasma sheet driven by the convective electric field undergo E × B drift and are trapped by the geomagnetic field to form a ring current. On the basis of this theory, full consideration is given to the influence of the ring current loss and ion deposition caused by charge exchange, The distribution of ring current ions during the main phase of the storms was verified.The distribution characteristics of the ring current ions in the magnetosphere during different phases of the storms were simulated.The response of some ring current ions to the convection electric field was studied.The results show that the asymmetric ring current is The main component of the ring current during the main phase of the storms is the distribution characteristics of the twilight asymmetry, the asymmetry of the ionospheric angle, and the anisotropy of the ion throw angle distribution, etc. The convective electric field is positively correlated with the intensity and distribution of energy flux. The simulation results are in good agreement with the observations, which proves the feasibility of the model.