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arXiv 0903.3546astro-ph.SR
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太阳低层大气中的阿尔芬波

Alfven Waves in the Lower Solar Atmosphere

D. B. Jess, M. Mathioudakis, R. Erdelyi, P. J. Crockett, F. P. Keenan, D. J. Christian

摘要:

我们报告了与一个面积为43万平方公里的大亮点群相关的振荡现象的探测,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。

英文摘要:

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.

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