论文标题
黑子振荡的签名和色球共振的情况
Signatures of sunspot oscillations and the case for chromospheric resonances
论文作者
论文摘要
黑子有各种各样的振荡现象，其特性取决于波模式的性质以及该点的磁性和热力学结构。与光球相比，伞形色振荡振荡表现出显着差异。它们显示出增强的功率和较短的优势时期，从光球的五分钟带中的幅度为每秒几百米的波，到染色体的三分钟带中的每秒几公里的幅度。已经提出了各种模型来解释这种行为，包括光球和过渡区域之间存在色层共振腔。杰西等。 （2020年，自然天文学，4，220）声称从光谱观测和数值模拟的比较中获得了支持该模型的观察证据。在这里，这表明杰西等人报道的观察性见解。不是黑子的共同特性。更重要的是，数值建模还表明，它不是声音谐振器的明确特征。
Sunspots host a large variety of oscillatory phenomena, whose properties depend on the nature of the wave modes and the magnetic and thermodynamic structure of the spot. Umbral chromospheric oscillations exhibit significant differences compared to their photospheric counterparts. They show an enhanced power and a shorter dominant period, from waves with an amplitude of a few hundred meters per second in the five-minute band at the photosphere, to amplitudes of several kilometers per second in the three-minute band at the chromosphere. Various models have been proposed to explain this behaviour, including the presence of a chromospheric resonance cavity between the photosphere and the transition region. Jess et al. (2020, Nature Astronomy, 4, 220) claimed the detection of observational evidence supporting this model, obtained from the comparison of spectropolarimetric observations and numerical simulations. Here, it is shown that the observational insight reported by Jess et al. is not a common property of sunspots. More importantly, numerical modelling also shows that it is not an unequivocal signature of an acoustic resonator.
