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arXiv 0708.4309astro-ph
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太阳活动区动力学的Hinode EUV成像光谱仪观测

Hinode EUV Imaging Spectrometer Observations of Solar Active Region Dynamics

John T. Mariska, Harry P. Warren, Ignacio Ugarte-Urra, David H. Brooks, David R. Williams, Hirohisa Hara

摘要:

Hinode卫星上的极紫外成像光谱仪能够测量高斯谱线轮廓的发射线中心位置,精确到光谱像素的一小部分,从而对强谱线进行相对太阳多普勒频移测量,精度低于1 km/s。我们展示了一个应用程序的一个例子,该能力的一个活跃的区域坐和凝视观察,其中的EIS狭缝被放置在一个位置上的太阳和许多曝光,而航天器跟踪保持相同的太阳位置内的狭缝。对于活动区域检查(NOAA 10930),我们发现,显着的强度和多普勒频移波动作为时间的函数存在于一些位置。这些波动似乎与其他空间光谱仪器在高温发射谱线中观察到的波动相似。由于其灵敏度比早期的光谱仪更高,并且能够同时对许多发射线进行成像,EIS应该为日冕中的多普勒频移振荡提供重要的新约束。

英文摘要:

The EUV Imaging Spectrometer (EIS) on the Hinode satellite is capable of measuring emission line center positions for Gaussian line profiles to a fraction of a spectral pixel, resulting in relative solar Doppler-shift measurements with an accuracy of less than a km/s for strong lines. We show an example of the application of that capability to an active region sit-and-stare observation in which the EIS slit is placed at one location on the Sun and many exposures are taken while the spacecraft tracking keeps the same solar location within the slit. For the active region examined (NOAA 10930), we find that significant intensity and Doppler-shift fluctuations as a function of time are present at a number of locations. These fluctuations appear to be similar to those observed in high-temperature emission lines with other space-borne spectroscopic instruments. With its increased sensitivity over earlier spectrometers and its ability to image many emission lines simultaneously, EIS should provide significant new constraints on Doppler-shift oscillations in the corona.

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