双极有源区速度振荡幅度的不对称性
On the asymmetry of velocity oscillation amplitude in bipolar active regions
摘要：
太阳低层大气中的速度场与磁场发生强相互作用。许多作者指出，在磁性区域内，根据频率、深度、磁通管的半径和磁场强度，功率会降低2到3倍。人们提出了许多机制来解释这些观察结果。本文利用12个双极有源区（$β$ AR）在45秒频率下的SDO多普勒图和磁图，研究了速度涨落与磁场的关系。我们发现，有一个不对称的$β$ AR内，与速度振荡幅度被更多的抑制在领先的极性相比，拖尾极性。此外，最强的磁场并不能完全抑制五分钟的振荡幅度，在光斑最里面的本影中也是如此。
英文摘要：
The velocity field in the lower solar atmosphere undergoes strong interactions with magnetic fields. Many authors have pointed out that power is reduced by a factor between two and three within magnetic regions, depending on frequency, depth, the radius and the magnetic strength of the flux tube. Many mechanisms have been proposed to explain the observations. In this work, SDO dopplergrams and magnetograms of 12 bipolar active regions ($β$ARs) at a 45 second cadence, are used to investigate the relation between velocity fluctuations and magnetic fields. We show that there is an asymmetry within $β$ARs, with the velocity oscillation amplitude being more suppressed in the leading polarities compared to the trailing polarities. Also, the strongest magnetic fields do not completely suppress the five-minute oscillation amplitude, neither in the spot innermost umbrae.
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