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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Earthward directed CMEs seen in large-scale coronal magnetic field changes, SOHO LASCO coronagraph and solar wind
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Earthward directed CMEs seen in large-scale coronal magnetic field changes, SOHO LASCO coronagraph and solar wind

机译：在大型日冕磁场变化，SOHO LASCO日冕仪和太阳风中看到向地球定向的CME

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One picture of coronal mass ejection (CME) initiation relates these events to the expansion into space of previously closed coronal magnetic fields, often part of the helmet streamer belt. The work described here makes use of the potential field source surface model based on updated synoptic photospheric field maps to study the large-scale coronal field changes. We isolate those field lines that change from closed to open configurations (newly opening field lines) by comparing potential field source surface models from adjacent magnetograph observations, wherein the same starting foot points on the photosphere are used. If there are some newly opening field lines between the times of two maps, we assume there was a possibility for CME occurrence(s) between these times. In particular, if there are newly opening field lines near the solar disk center, an earthward directed CME may have been generated. Monitoring the coronal magnetic field behavior can in principle reinforce (or not) days in advance predictions of magnetic storms based on Solar and Heliospheric Observatory (SOHO) Large-Angle Spectrometric Coronagraph (LASCO) halo CMEs. Moreover, the coronal field over the visible hemisphere contains information about the possible geoeffectiveness of a particular CME because it shows the approximate orientation and location of the active arcades. By comparing halo CMEs with the newly opening field lines, the solar wind measurements from Wind and ACE spacecraft and the Dst index, we show that, like soft X-ray sigmoids, disappearing filaments, and Extreme ultraviolet Imaging Telescope (EIT) waves on the disk of the Sun, magnetograph observation-based coronal field models may provide additional information on the likelihood of CME effects at the Earth. [References: 40]
机译：一张冠状物质抛射（CME）启动的图片将这些事件与先前封闭的冠状磁场（通常是头盔流光带的一部分）扩展到太空有关。这里描述的工作利用了基于更新的天气光球场图的势场源表面模型来研究大规模日冕场的变化。我们通过比较来自相邻磁图观测器的潜在场源表面模型（从光球上使用相同的起始脚点）来比较那些从封闭配置更改为开放配置（新开放的场线）的场线。如果在两个地图的时间之间存在一些新打开的场线，则我们假设在这两个时间之间可能发生CME。特别是，如果在太阳磁盘中心附近有新开放的场线，则可能已经生成了向地球方向的CME。监视冠状磁场的行为原则上可以基于太阳和日球观测台（SOHO）大角度光谱日冕仪（LASCO）晕圈CME提前（或不增加）几天的电磁风暴预报。此外，可见半球上的日冕场包含有关特定CME可能的地球有效性的信息，因为它显示了活动拱廊的大致方向和位置。通过比较晕圈CME与新近打开的场线，Wind和ACE航天器的太阳风测量结果以及Dst指数，我们发现，像软X射线乙状结肠，消失的细丝和极紫外成像望远镜（EIT）波一样，在太阳圆盘上，基于磁力观测的日冕场模型可能会提供有关地球上CME效应可能性的更多信息。 [参考：40]

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