Observations of a rotating macrospicule associated with an X-ray jet
Observations of a rotating macrospicule associated with an X-ray jet
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DOI：
10.1051/0004-6361/200913269
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发表时间：
2010-01
影响因子：
6.5
通讯作者：
S. Kamio;W. Curdt;L. Teriaca;B. Inhester;S. Solanki
中科院分区：
文献类型：
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作者：
S. Kamio;W. Curdt;L. Teriaca;B. Inhester;S. Solanki
目标。我们试图理解大针的驱动机制及其与日冕喷流的关系。方法：研究方法。我们研究了由多个航天器观测捕获的大针叶及其相关的日冕喷流的动力学。大针叶和日冕喷流中的多普勒速度是由EIS和Sumer谱确定的。利用X射线和He IIλ3 0 4图像研究了它们的时间演化。结果。大针一侧的蓝移为-12 0±15 km S-1，另一侧底部为5 0±6 km的S-1。从STEREO的立体分析中推断出的大针倾斜角表明，测量的多普勒速度可以归因于大针的旋转运动，而不是径向流动或膨胀。结论。大针是由扭曲的磁通量绳的展开运动驱动的，而与之相关的X射线喷流则是径向外流。
Aims. We attempt to understand the driving mechanism of a macrospicule and its relationship with a coronal jet. Methods. We study the dynamics of a macrospicule and an associated coronal jet captured by multi-spacecraft observations. Doppler velocities in both the macrospicule and the coronal jet are determined by EIS and SUMER spectra. Their temporal evolution is studied using X-ray and He II λ304 images. Results. A blueshift of -120 ± 15 km s -1 is detected on one side of the macrospicule, while a redshift of 50 ± 6 km s -1 is found at the base of the other side. The inclination angle of the macrospicule inferred from a stereoscopic analysis with STEREO suggests that the measured Doppler velocities can be attributed to a rotating motion of the macrospicule rather than a radial flow or an expansion. Conclusions. The macrospicule is driven by the unfolding motion of a twisted magnetic flux rope, while the associated X-ray jet is a radial outflow.