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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Moderate geomagnetic storm (21-22 January 2005) triggered by an outstanding coronal mass ejection viewed via energetic neutral atoms
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Moderate geomagnetic storm (21-22 January 2005) triggered by an outstanding coronal mass ejection viewed via energetic neutral atoms

机译：中等磁暴(2005年1月21 - 22日)由一位杰出的日冕物质抛射通过充满活力的中性原子

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An outstanding flare on 20 January 2005 was accompanied by a coronal mass ejection which arrived at the magnetopause at ～1712 UT, 21 January, and produced a strong compression-pressure pulse. Enhanced magnetospheric activity was stimulated. The associated development between 02.19 UT on 21-22 January, 2005 of a ring current disturbance in energetic neutral atom (ENA) data, recorded aboard both the Double Star and the IMAGE (Imager for Magnetopause-to-Aurora Global Exploration) spacecraft, is described. A magnetic storm from～1712 UT, 21 January, reached minimum Dst = ～101 nT at ～0600 UT, 22 January, and its recovery phase endured until 27 January.ENA data indicate that the ring current experienced a deep injection of H~+ and O~+ions at ～1830 UT when IMF Bz was oriented southward. At this time, the ring current was strongly asymmetric, although later it became more symmetric. Bz turned northward at 1946 UT. From ～0224 to ～0612 UT on 22 January, Bz fluctuated such that it intermittently pointed southward (±10 nT). The moderate but extended response of the geomagnetosphere to the strong pressure pulse is explained by a slow evolution in the orientation of Bz under conditions of enhanced plasma sheet density. Modeling of dynamical parameters that represent various current systems that contributed to Dst revealed their individual characteristics. The changing geomagnetic field was also modeled. Comparisons with ENA data show that early asymmetric enhancements recorded in hydrogen and oxygen were accompanied by intensified external current systems that produced a magnetic field related compression of the magnetosphere. The gradual reduction in ring current asymmetry was complemented by the largely symmetrical configuration displayed by the corresponding, still intensified, modeled magnetic field.
机译：2005年1月20日一位杰出的耀斑伴随着一个日冕物质抛射到达磁层~ 1712 UT, 21岁1月,产生一个强大的压缩压力脉冲。磁性层的活动受到了刺激。 02.19 UT 1月21 - 22日,2005年的戒指电流扰动在精力充沛的中性原子(ENA)数据,记录在双星和图像(成像仪Magnetopause-to-Aurora全球勘探)航天器,描述。从~ 1712 UT磁暴,1月21日,最低Dst = ~ 101元~ 0600 UT, 1月22号,直到27日及其恢复阶段经历了1月。经历了一个深深的注入H ~ +和O ~ +离子在国际货币基金组织(IMF) ~ 1830 UT Bz面向被向南。这时,环电流是强烈的不对称的,尽管后来变得更多对称的。1月22日~ 0224 ~ 0612 UT, Bz波动,使其向南间歇性地指出(±10元)。geomagnetosphere强大压力脉冲解释是一个缓慢进化吗定位商务条件下增强等离子体密度。代表各种当前系统的参数导致Dst透露他们的个人特征。也被建模。早期的记录在不对称的增强氢和氧是伴随着加强外部电流系统产生一个磁场相关的压缩磁气圈。电流不对称很大程度上补充了对称配置显示的相应的,还愈演愈烈,建模磁场。

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