Alfven Waves in the Lower Solar Atmosphere
Alfven Waves in the Lower Solar Atmosphere
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DOI：
10.1126/science.1168680
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发表时间：
2009-03-20
期刊：
影响因子：
56.9
通讯作者：
Christian, Damian J.
中科院分区：
文献类型：
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作者：
Jess, David B.;Mathioudakis, Mihalis;Christian, Damian J.
通过太阳大气层的能量流动和太阳外部区域的加热仍然不清楚。在这里，我们报告了与一个面积为430，000平方公里的大型亮点群相关的振荡现象的检测，该亮点群位于太阳盘中心附近。小波分析揭示了全宽半最大振荡的周期范围从126到700秒以上的亮点和显着性水平超过99%。这些振幅为每秒2.6公里的振荡，与平均蓝移为每秒23公里的色球视线多普勒速度相结合。缺乏同空间强度振荡和横向位移排除了磁声波模式的存在。振荡是由+/-22度的扭转扭转产生的阿尔芬波的特征。跨越亮点直径的180度相移表明，这些扭转阿尔芬振荡在整个增亮过程中是全局诱导的。与这种波模式相关的能量通量足以加热日冕。
The flow of energy through the solar atmosphere and the heating of the Sun's outer regions are still not understood. Here, we report the detection of oscillatory phenomena associated with a large bright-point group that is 430,000 square kilometers in area and located near the solar disk center. Wavelet analysis reveals full-width half-maximum oscillations with periodicities ranging from 126 to 700 seconds originating above the bright point and significance levels exceeding 99%. These oscillations, 2.6 kilometers per second in amplitude, are coupled with chromospheric line-of-sight Doppler velocities with an average blue shift of 23 kilometers per second. A lack of cospatial intensity oscillations and transversal displacements rules out the presence of magneto-acoustic wave modes. The oscillations are a signature of Alfven waves produced by a torsional twist of +/- 22 degrees. A phase shift of 180 degrees across the diameter of the bright point suggests that these torsional Alfven oscillations are induced globally throughout the entire brightening. The energy flux associated with this wave mode is sufficient to heat the solar corona.