Chromospheric Alfvenic waves strong enough to power the solar wind
Chromospheric Alfvenic waves strong enough to power the solar wind
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DOI：
10.1126/science.1151747
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发表时间：
2007-12-07
期刊：
影响因子：
56.9
通讯作者：
Nagata, S.
中科院分区：
文献类型：
--
作者：
De Pontieu, B.;McIntosh, S. W.;Nagata, S.
阿尔芬波被认为是一种可能的机制，可以将太阳外层大气或日冕加热到数百万度，并将太阳风加速到每秒数百公里。然而，在太阳大气中并没有明确地观测到足够强的阿尔芬波。我们利用日本Hinode卫星上的太阳光学望远镜获得的高时空分辨率图像揭示了夹在太阳表面和日冕之间的色球区域被阿尔芬波渗透，阿尔芬波的强度约为每秒10至25公里，周期为100至500秒。对这些波携带的能量通量的估计，以及与先进的辐射磁流体模拟的比较表明，这些阿尔芬波的能量足以加速太阳风，并可能加热安静的日冕。
Alfven waves have been invoked as a possible mechanism for the heating of the Sun's outer atmosphere, or corona, to millions of degrees and for the acceleration of the solar wind to hundreds of kilometers per second. However, Alfven waves of sufficient strength have not been unambiguously observed in the solar atmosphere. We used images of high temporal and spatial resolution obtained with the Solar Optical Telescope onboard the Japanese Hinode satellite to reveal that the chromosphere, the region sandwiched between the solar surface and the corona, is permeated by Alfven waves with strong amplitudes on the order of 10 to 25 kilometers per second and periods of 100 to 500 seconds. Estimates of the energy flux carried by these waves and comparisons with advanced radiative magnetohydrodynamic simulations indicate that such Alfven waves are energetic enough to accelerate the solar wind and possibly to heat the quiet corona.