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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Some characteristics of intense geomagnetic storms and their energy budget
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Some characteristics of intense geomagnetic storms and their energy budget

机译：强烈的磁暴的一些特征和他们的能源预算

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The present study analyses nine intense geomagnetic storms (∣Dst∣ > 175 nT) with the aid of ACE satellite measurements and ground magnetic field values at Alibag Magnetic Observatory. The study confirms the crucial role of southward IMF in triggering the storm main phase as well as controlling the magnitude of the storm. The main phase interval shows clear dependence on the duration of southward IMF. An attempt is made to identify the multipeak signature in the ring current energy injection rate during main phase of the storm. In order to quantify the energy budget of magnetic storms, the present paper computes the solar wind energies, magnetospheric coupling energies, auroral and Joule heating energies, and the ring current energies for each storm under examination. Computation of the solar wind- magnetosphere coupling function considers the variation of the size of the magnetosphere by using the measured solar wind ram pressure. During the main phase of the storm, the solar wind kinetic energy ranges from 9 × 1017 to 72 × 1017 J with an average of 30 × 1017 J; the total energy dissipated in the auroral ionosphere varies between 2 × 1015 and 9 × 1015 J, whereas ring current energies range from 8 × 1015 to 19 × 1015 J. For the total storm period, about 3.5% of total solar wind kinetic energy is available for the redistribution in the magnetosphere, and around 20% of this goes into the inner magnetosphere and in the auroral ionosphere of both the hemispheres. It is found that during main phase of the storm, almost 5% of the total solar wind kinetic energy is available for the redistribution in the magnetosphere, whereas during the recovery phase the percentage becomes 2.3%.
机译：本研究分析九激烈地磁风暴(∣Dst∣> 175元)的援助ACE卫星测量和地面磁字段值Alibag磁天文台。研究证实了国际货币基金组织(IMF)向南的至关重要的作用主要阶段以及引发的风暴控制风暴的大小。相间隔显示明显的依赖国际货币基金组织(IMF)向南的持续时间。识别multipeak环签名当前能源注入率的主要阶段的风暴。预算磁性风暴,摘要计算太阳风的能量,磁性层的耦合能量,极光和焦耳加热能量,环电流能量风暴在考试。风-磁层耦合函数考虑磁气圈的大小的变化使用测量太阳风内存压力。在风暴的主要阶段,太阳能风的动能范围从×9×1017到721017 J的平均30×1017;在极光电离层能量消散2×1015和9×1015 J之间各不相同,而环电流能量从19×8×10151015 j .总风暴期间,大约3.5%的太阳风总动能是可用的磁气圈的再分配大约20%的进入内部磁气圈和极光的电离层这两个半球。主要阶段的风暴,几乎占总数的5%太阳风动能是可用的磁气圈的再分配,而在经济复苏阶段的百分比2.3%.

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