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为了研究地磁活动指数D_(st)受太阳风参数影响,包括行星际磁场(IMF)南向分量B_(st)、太阳风速度V_(?)和太阳风-磁层发电机电动势U调制的机制,应用太阳风-磁层-电离层输入-输出[I(t)-O(t)]电网络模型,对磁层亚暴与磁层暴过程中,B_z(t)-D_(st)、V-a(t)-D_(st)和U(t)—D_(st)的激励-响应特性进行模拟。研究表明,B_z是形成亚暴与磁层暴的前提条件,V_(st)是形成亚暴与磁层暴的充分条件,二者统一于电动势U_(st)研究结果与观测结果一致。
In order to study the mechanism that the geomagnetic activity index D st is affected by the solar wind parameters, including the southbound component st (St), the solar wind velocity V_ (?) And the solar-magnetic-generator electromotive force U modulation, the solar wind - Magnetic layer - ionospheric input - output [I (t) -O (t)] electric network model for the sub-storms and magnetospheric storms, B_z (t) -D_ (st) and U (t) -D_ (st) excitation-response characteristics of the simulation. The results show that B_z is the prerequisite for the formation of sub-storms and magnetospheric storms. V st is the sufficient condition for the formation of sub-storms and magnetospheric storms. The results of the two studies are in good agreement with the observations.