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arXiv 1012.1196astro-ph.SR
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色球层中的波:观测

Waves in the chromosphere: observations

R. J. Rutten

摘要:

我回顾了文献观测方面的波在太阳色球层在第一部分的贡献。高频波被用来建立复杂的冷星色球加热理论,但迄今为止还没有被明确地探测到,既不是网络元素中的磁模式,也不是树冠下互联网络区域中的声学模式。三分钟向上传播的声震是通过数值模拟作为间歇性明亮网络间颗粒的原因而彻底建立的,但它们的活塞作用及其在低色球层能量收支中的作用仍存在争议。三分钟波与磁冠的相互作用是一个较新的兴趣,目前正在通过数值模拟。三分钟的阴影闪光和运行半影波似乎是一个类似的声冲击现象,等待数值模拟。低频网络多普勒调制仍然是个谜。在第二部分中,我更详细地讨论了网间色球层的低频紫外线亮度变化。它们贡献了大约一半的网络间亮度调制,并可能在冷星基底通量中占据一席之地。它们似乎是一个混合物的反对比度颗粒过冲在小尺度和重力波干扰中颗粒尺度。我目前的TRACE证据后一种解释,并推测,低频亮度极小值地图冠层高度。

英文摘要:

I review the literature on observational aspects of waves in the solar chromosphere in the first part of this contribution. High-frequency waves are invoked to build elaborate cool-star chromosphere heating theories but have not been detected decisively so far, neither as magnetic modes in network elements nor as acoustic modes in below-the-canopy internetwork regions. Three-minute upward-propagating acoustic shocks are thoroughly established through numerical simulation as the cause of intermittent bright internetwork grains, but their pistoning and their role in the low-chromosphere energy budget remain in debate. Three-minute wave interaction with magnetic canopies is a newer interest, presently progressing through numerical simulation. Three-minute umbral flashes and running penumbral waves seem a similar acoustic-shock phenomenon awaiting numerical simulation. The low-frequency network Doppler modulation remains enigmatic. In the second part, I address low-frequency ultraviolet brightness variations of the internetwork chromosphere in more detail. They contribute about half of the internetwork brightness modulation and presumably figure in cool-star basal flux. They appear to be a mixture of inverse-contrast granular overshoot at small scales and gravity-wave interference at mesogranular scales. I present TRACE evidence for the latter interpretation, and speculate that the low-frequency brightness minima map canopy heights.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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