慢磁声波在黑子上方冕环中的传播

发布时间：2018-01-17 01:10

本文关键词：慢磁声波在黑子上方冕环中的传播　出处：《天文学报》2013年01期 　论文类型：期刊论文

【摘要】：太阳动力学观测站(Solar Dynamics Observatory,SDO)装载的太阳大气成像系统(Atmospheric Imaging Assembly,AIA)通过3个极紫外波段(171 A、193 A和211(?))的观测资料展现了太阳活动区(AR 11092)扇形冕环微弱的扰动传播,这种波动现象普遍存在于活动区冕环.该扰动传播起源于明亮的环足处,其传播沿冕环方向.冕环中观测到的扰动传播速度随温度升高而减小,速度范围是40～121 km/s,其值接近且小于声速.考虑投影效应以及环与视线方向的倾角大小,这正好是慢波模型所预期的.冕环的扰动周期在不同波段(3个极紫外波段)没有明显的区别,都存在3 min以及10多分钟的周期.此外,不仅仅冕环扰动表现出3 min左右的周期,色球层的黑子区域同样存在相同的振荡周期.这个结果表明黑子振荡是可以穿过色球以及过渡区到达日冕的.
[Abstract]:Solar Dynamics Observatory. SDO) carries the solar atmospheric imaging system, Atmospheric Imaging AssemblyAIAA, through three extreme ultraviolet wavebands of 171A. 193A and 211A? The observational data show the weak disturbance propagation of the sector coronal ring in the solar active region AR11092, which generally exists in the coronal ring of the active region. The disturbance propagation originates from the bright ring foot. The propagating velocity of the disturbance in the coronal ring decreases with the increase of temperature, and the velocity range is 400.121 km/s. Its value is close to and smaller than the velocity of sound. The projection effect and the angle of inclination between the ring and the line of sight are considered. This is exactly what the slow-wave model expects. There is no obvious difference in the perturbed period of the coronal ring in different bands (three extreme ultraviolet bands), and there is a period of 3 min and more than 10 minutes. Not only does the coronal cycle show a period of about 3 min, but the sunspot region of the chromospheric layer also has the same oscillation period, which indicates that the sunspot oscillation can reach the corona through the chromosphere and the transition region.
【作者单位】：云南师范大学物理与电子信息学院;中国科学院云南天文台;
【基金】：国家自然科学基金项目(10878014,11063005) 云南省自然科学基金项目(2009CD046,2007A194M)资助
【分类号】：P182.62
【正文快照】： 1己l生{一J二二二通常存在于太阳大气中的磁流体力学波有慢磁声波、快磁声波和阿尔芬波等.其中慢磁声波出现在极羽以及冕环中，这种波的传播会导致冕环和极羽产生振荡幅度较小的准周期性扰动.研究普遍认为，这些波动现象与太阳的大气加热机制密切相关，，因此，研究慢磁声波的

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