行星级磁场的统计性质及其与地磁活动关系的研究

来源 :第十届海峡两岸空间/太空科学研讨会 | 被引量 : 0次 | 上传用户：xiaok131

【摘要】

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【作者】

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张湘云

【机构】

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美国密歇根大学安娜堡分校 48105

【出处】

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第十届海峡两岸空间/太空科学研讨会

【发表日期】

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2012年7期

【关键词】

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行星级磁场太阳风结构地磁活动

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我们利用空间观测数据和地球磁场活动指数,对行星际磁场z分量的统计性性质,在不同太阳风结构中的特性,及其与地球磁场活动的关系进行了研究.结果显示行星际磁场南北分量的极性伴随着普遍的高频扰动(2-3 分钟),即使在流相互作用区域(SIR),小尺度磁通绳(SMFR),以及磁云(MC)中也存在.另外,我们也发现长时间的南向行星际磁场主要来自磁云(长于2 小时)或者小尺度磁通绳(1 到2 小时).统计分析还表明强的南向磁场(小于-5 nT)有着明显的太阳活动周期趋势.通过归一化时间叠加分析,我们也提出,极性变化相同的磁云和小尺度磁通绳与地球磁场活动指数(AE 和SYM-H)的相关性不同.同时,我们还分析了高精度的磁场以及太阳风数据以研究这三种类别的能谱特征,有利于进一步了解这些结构的起源.

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行星级磁场的统计性质及其与地磁活动关系的研究

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