When reconnection is initiated on the dayside magnetopause , the interconnected imf and geomagnetic field lines are swept back by the solar wind over the earth ' s poles , pouring energy into the northern and southern lobes of the long magnetotail on the nightside 当磁力线重连在昼侧的磁层顶上开始发生，连在一起的imf和地球磁场磁力线便被太阳风往后吹，扫过地球南北极，把能量灌入长磁尾的南北两叶。
And the expression of magnetic flux density b is got by making use of the relation of magnetic vector potential a and magnetic flux density b . finally , the equation of the magnetic flux lines is given by way of describing the distributing of the magnetic field 通过求解该边值问题得到了相应的矢量磁位a的解析表达式，然后利用矢量磁位a和磁感应强度召的关系求得了磁感应强度b的解析表达式。最后为了更直观地描述磁场的分布给出了相应的磁力线方程。
Moreover , a method for iterating thermal and magnetic analysis is put forward . in chapter 5 , the distributed characteristics of eddy and temperature fields in induction heating process are simulation by fem respectively , including the distributions of eddy and temperature fields during the whole induction heating process , the influence of frequency and magnetic disperse , and the prediction of hardened depth 第五章:用ansys软件对感应加热过程中工件内涡流场、温度场的一些基本问题进行模拟及分析，主要包括:加热过程中工件涡流功率密度及温度分布规律;频率与磁力线逸散对加热效果的影响;同时对感应淬火淬硬层深度进行了模拟预测。
The two sunspots of a pair have different polarities , one would be a magnetic north and the other is a magnetic south . thus , we believe that there are magnetic field lines joining the two sunspots of a pair . the strong magnetic field locks the gas of the photosphere in places and inhibits the hotter gas below to rise at the sunspots 黑子经常成双成对出现，每对皆由极性相反的黑子组成，若一个为磁北，另一个必为磁南，由此我们估计每对黑子皆由磁力线所连系，强大的磁场牵制著光球层上的气体，并阻止了下层较炽热的气体上升至黑子范围，结果黑子比太阳表面其他地方温度较低。
Electromagnetic heat is generated from the coils that are transmitted with high frequency electric currents , when magnetic metal cookware is used , high magnetic frequencies are generated , thereby creating huge volumes of whirling fluids , which is transformed from electric power into heat power 电磁炉具热源的产生是利用高频电流通过一组线圈，形成高频交变磁场，磁场的磁力线穿过铁磁材料的金属锅，作用于锅体内的粒子，使其剧烈运动、磨擦，即时产生极高的温度场，将电能转化成热能。
