Observations of Doppler Shift Oscillations with the EUV Imaging Spectrometer on Hinode
Observations of Doppler Shift Oscillations with the EUV Imaging Spectrometer on Hinode
复制标题
使用 Hinode 上的 EUV 成像光谱仪观察多普勒频移振荡
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Tetsuya Watanabe
中科院分区：
文献类型：
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作者：
J. Mariska;H. Warren;David R. Williams;Tetsuya Watanabe
用太阳和日光层观测站的太阳紫外线辐射光谱仪和横滨的布拉格晶体光谱仪在耀斑温度下形成的离子的发射线中观测到阻尼多普勒频移振荡。这封信报告了用Hinode卫星上的EUV成像光谱仪观测到的在低得多的温度下形成的日冕发射线中的低振幅阻尼振荡。振荡的振幅约为2 km s-1，周期约为35分钟。衰减时间显示出温度依赖性的一些证据，最低温度的形成发射线（Fe XII 195.12 ℃）显示出约43分钟的衰减时间，而最高温度的形成发射线（Fe XV 284.16 ℃）在两个以上的振荡周期内没有显示出衰减的证据。这些数据似乎是一致的慢磁声驻波，但可能是不一致的导电阻尼。
Damped Doppler shift oscillations have been observed in emission lines from ions formed at flare temperatures with the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on the Solar and Heliospheric Observatory and with the Bragg Crystal Spectrometer on Yohkoh. This Letter reports the detection of low-amplitude damped oscillations in coronal emission lines formed at much lower temperatures observed with the EUV Imaging Spectrometer on the Hinode satellite. The oscillations have an amplitude of about 2 km s−1 and a period of around 35 minutes. The decay times show some evidence for a temperature dependence with the lowest temperature of formation emission line (Fe XII 195.12 Å) exhibiting a decay time of about 43 minutes, while the highest temperature of formation emission line (Fe XV 284.16 Å) shows no evidence for decay over more than two periods of the oscillation. The data appear to be consistent with slow magnetoacoustic standing waves, but may be inconsistent with conductive damping.