interstellar magnetic field 基本例句 星际磁场 A preliminary analysis shows that the east-west asymmetry in the heliospheric equatorial plane is mainly attributed to the spiral structure of the interplanetary magnetic field.初步分析表明,行星际磁场的螺旋结构是产生日球赤道面内双重激波对结构东西不对称性的主要原因。