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模拟IMF北向且By分量占主导时磁层顶重联

DOI: 10.6038/cjg20130401, PP. 1065-1069

Keywords: 磁层顶,磁重联,北向IMF,磁尾,MHD模拟

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Abstract:

本文基于自己开发的全球三维磁层模型,模拟研究了IMF(InterplanetaryMagneticField)北向并且By分量较大(时钟角为60°)时磁层顶三维结构及其重联图像.结果发现,IMFBy为正时,在北极隙区附近尾-昏侧存在IMF与地磁场之间稳定持续的重联现象;参与重联的地球磁场既有闭合磁力线也有开放磁力线;IMF在北极隙区与地球闭合磁力重联后一端与南磁极相连的磁力线在尾向运动时还可能与北尾瓣的开放磁力线重联而重新闭合,这种重联与磁力线循环过程不同于同一条IMF磁力线分别在南北半球与地磁场重联的模型.南极隙区的重联发生在尾-晨侧,其动力学过程与北极隙区情形类似.我们的模拟结果表明,IMFBy较大时不可能发生IMF同一条磁力线分别在南北极隙区重联的情形,也不会因此而减少尾瓣的开放磁力线.

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