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arXiv 1202.1384astro-ph.SR
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太阳光球层中的三分钟波增强

Three-minute wave enhancement in the solar photosphere

M. Stangalini, F. Giannattasio, D. Del Moro, F. Berrilli

摘要:

一个众所周知的结果是,太阳光球层中的磁场会逐渐降低五分钟振荡的功率。许多作者指出,这一事实可能是由于许多过程的复杂相互作用:不透明效应,MHD模式转换和内在的降低声发射率在强磁场。虽然五分钟振荡是光球层的主要成分,但已经表明色球层高度反过来又由三分钟振荡主导。两个主要的理论已被提出来解释它们的存在的基础上,在大气腔中的谐振滤波和非线性相互作用。在这项工作中,我们表明,通过分析IBIS观测的太阳孔在光球Fe I 617.3 nm线,三分钟波已经存在于形成的高度,这条线,其振幅取决于磁场强度,并严格限制在本影区域。

英文摘要:

It is a well-known result that the power of five-minute oscillations is progressively reduced by magnetic fields in the solar photosphere. Many authors have pointed out that this fact could be due to a complex interaction of many processes: opacity effects, MHD mode conversion and intrinsic reduced acoustic emissivity in strong magnetic fields. While five-minute oscillations are the dominant component in the photosphere, it has been shown that chromospheric heights are in turn dominated by three-minute oscillations. Two main theories have been proposed to explain their presence based upon resonance filtering in the atmospheric cavity and non linear interactions. In this work we show, through the analysis of IBIS observations of a solar pore in the photospheric Fe I 617.3 nm line, that three-minute waves are already present at the height of formation of this line and that their amplitude depends on the magnetic field strength and is strictly confined in the umbral region.

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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