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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Detection of coronal mass ejection associated shock waves in the outer corona
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Detection of coronal mass ejection associated shock waves in the outer corona

机译：在外日冕中探测与冠状物质抛射有关的冲击波

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White light coronal images from the Large-Angle Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) spacecraft show disturbances propagating away from high speed coronal mass ejections (CMEs). The disturbances are faintly visible ahead of the ejected material at the noses of the CMEs but are strongly visible along the flanks and rear ends, where they produce kinks in the streamers and other raylike features that extend in all directions from the Sun at this phase of the sunspot cycle. The kinks decelerate as they move radially outward along the rays, apparently indicating the slowing of the entire wave front as it passes by. For a fast CME seen head on (or tail on) the deceleration occurs at virtually all position angles around the occulting disk. However, for a CME seen obliquely the speed varies strongly with position angle, being fast and uniform near the nose but slower and decelerating at the sides and rear where the deflected rays are more inclined from the sky plane and farther from the Sun. The initial speeds (greater than or similar to 800-1400 km/s) are faster than the nominal MHD speed (similar to 600 km/s) at these heights, implying that these disturbances are shock waves, made visible like "amber waves of grain" [Bates, 1895] in the field of coronal rays around the Sun. [References: 32]
机译：太阳和日球天文台（SOHO）航天器上的大角度光谱日冕仪（LASCO）的白光日冕图像显示了远离高速日冕质量抛射（CME）传播的干扰。扰动在CME机头的喷出材料之前微弱可见，但在侧面和后端很明显，它们在拖缆和其他射线状特征中产生扭结，在此阶段从太阳向所有方向延伸。黑子周期。扭结随着它们沿射线径向向外移动而减速，这显然表明整个波阵面通过时变慢。对于快速CME而言，正面（或尾部）上的减速几乎发生在潜盘周围的所有位置角度处。但是，对于倾斜观察的CME，速度随位置角变化很大，在鼻子附近速度均匀，但速度较慢，并且在偏斜的光线从天空平面倾斜到离太阳更远的侧面和背面减速。在这些高度下，初始速度（大于或类似于800-1400 km / s）比标称MHD速度（类似于600 km / s）要快，这意味着这些干扰是冲击波，像“谷物”（贝茨，1895年）位于太阳周围日冕射线的领域。 [参考：32]

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