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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dependence of Electromagnetic Ion Cyclotron Wave Occurrence on North-South Orientation of Interplanetary Magnetic Field: THEMIS Observations
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Dependence of Electromagnetic Ion Cyclotron Wave Occurrence on North-South Orientation of Interplanetary Magnetic Field: THEMIS Observations

机译：依赖的电磁离子回旋波发生在南北方向行星际磁场:忒弥斯观察

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摘要

We investigate the L-MLT (i.e., L-shall versus magnetic local time) distributions of electromagnetic ion cyclotron (EMIC) waves, using the Time History of Events and Macroscale Interactions during Substorms data from 2009 to 2014, under prolonged (more than 4 h) intervals of northward and southward interplanetary magnetic fields (IMFs). H-band EMIC waves show high occurrence in the dawn-to-postnoon sector (0400-1600 MLT) at L > ~7 for northward IMFs. On the other hand, for southward IMFs, H-band EMIC waves occur in the morning-to-afternoon sector (0700-1500 MLT), and no strong wave activity is found in the dawn sector (0400-0700 MLT). H-band EMIC waves are frequently observed in the region where the ambient temperature anisotropy for ~1-25 keV ions is high. He-band EMIC waves show high occurrence in the noon-to-dusk sector (1100-2000 MLT) for both IMF BZ conditions. In the dusk sector,however, the high occurrence region is shifted into the inner L-shell for southward IMFs (L < 8) in contrast to that observed for northward IMFs (L < 10). He-band EMIC waves are shown to be generated in the region where the total plasma density is high (especially near the plasmapause). The occurrence rates of EMIC waves are lower overall for southward IMFs than for northward IMFs for both H-band and He-band waves. We suggest that an increase of heavy ion (i.e., He~+ and O~+) concentration is likely associated with low occurrence rates in both frequency bands for southward IMFs.
机译：我们调查L-MLT(即L-shall vs磁当地时间)的分布电磁离子回旋波(位的),使用时间的历史事件和宏观尺度从2009年到交互在亚暴的数据2014年,在长期(超过4小时)的时间间隔向北和向南星际磁场(货币)。dawn-to-postnoon部门的发生率较高(0400 - 1600年MLT) L > ~ 7首先向北。另一方面,货币基金向南,淬透性带位的波发生在morning-to-afternoon部门(0700 - 1500年MLT),没有强大的波活动发现在黎明部门(0400 - 0700年MLT)。位的波在该地区经常被观察到在环境温度各向异性~ 1 - 25 keV离子高。noon-to-dusk部门的发生率较高(1100 - 2000年MLT)对国际货币基金组织的商务条件。然而,黄昏部门高地区转移到内部l层向南货币基金(L < 8)相反观察北方货币基金(L < 10)。位的波浪生成的显示地区总等离子体密度高(特别是在等离子体层顶附近)。位的波率较低的整体向南比北方货币的货币淬透性带和乐队。增加了重离子(即他~ +和O ~ +)浓度很可能与低有关出现率在两个频段

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