磁云—高速流相互作用的数值模拟

对１９７８年８月２７至２８日期间观测到的磁云与尾随高速流的相互作用进行数值模拟，基本拟合了１ＡＵ处的观测剖面。模拟结果表明，磁云－高速流系统将导致前向快，慢激波和后向快激波的形成。

NUMERICAL SIMULATION OF MAGNETIC CLOUDHIGHSPEED STREAM INTERACTION

A numerical simulation is carried out on the interaction between the magnetic cloud and the follow-up highspeed stream observed at 1 AU August 27 - 28,1978, and it basically reproduces the observed profiles. The numerical results show that the magnetic cloud - highspeed stream system leads to the formation of a forward fast and slow shock as well as a reverse fast shock. The forward fast and slow shocks originate from the magnetic cloud whereas the reverse fast shock is generated by the highspeed stream. However, the properties of these shocks have been affected by the interaction between the magnetic cloud and the high speed stream in various degrees. Under the pursuit of the highspeed stream, the magnetic cloud is restrained from expansion at its tail part, where a structure of high temperature, high density and strong magnetic field is formed.