伴随磁层稳态对流的磁暴及磁暴期间环电流的特征

In this paper, 12 magnetic storms accompanied with Steady Magnetospheric Convection (SMC) were selected from 2001 to 2017 based on our new criterion. It was found that these magnetic storms have the same characteristics: a long main phase up to about 10 hours; a minimum platform period for each of their SYM-H, which lasts about 3 to 10 hours; when these magnetic storms occur, the partial ring current is located at the dusk-side constantly, and its duration is equal to the stable southward driving time of the B_z component of IMF. In addition, the ion loss time during its platform period was calculated, though there were some differences in the lifetime of the ions in different events, the lifetime of the ions in our events is much longer than models. And there is no obvious relationship between the lifetime of the ions and the length of the platform period. Based on our study, the decay of ring current is slowed down as the the SMC event during the magnetic storm brings more energy.