Continuing Measurements of Solar Oscillations

这笔拨款将继续加州理工学院和大熊太阳天文台（BBSO）目前正在进行的日震学项目。在过去的几年里，测量太阳p模振荡的方法有了许多改进，以至于BBSO测量的p模频率、频裂、线宽和振幅在任何地方都是最好的。这些测量已被用来更好地理解p模态的激发和衰减，测量太阳旋转作为深度和纬度的函数，并推断太阳内部的其他性质。这项工作将继续进行，以实现以下科学目标：1)改进太阳内部旋转的测量，从核心深处一直到表面；2)继续监测观测到的太阳周期在p模频裂中的变化，这被认为是由太阳内部大规模的随时间变化的温度变化引起的；3)提高我们对p模激励和阻尼过程的理解；4)利用振动研究太阳大气的性质。这项工作的总体目标是使用复杂的日震学技术来辨别太阳的内部动力学。这反过来告诉我们11年的变化。显然，这对日地关系很重要。

This grant will continue the helioseismology program that is currently ongoing at California Institute of Technology and Big Bear Solar Observatory (BBSO). In the past several years many improvements have been made in methods for measuring solar p-mode oscillations, to the point where the BBSO measurements of p-mode frequencies, frequency splittings, linewidths, and amplitudes are among the best anywhere. These measurements have been used to better understand the excitation and dampening of the p-modes, to measure the solar rotation as a function of depth and latitude, and to infer other properties of the solar interior. This work will continue with the following scientific goals in mind: 1) to improve the measurement of the sun's internal rotation, from the deep core right up to the surface; 2) to continue monitoring the observed solar cycle variations in the p-mode frequency splittings, which are thought to arise from large-scale time-dependent temperature variations inside the sun; 3) to improve our understanding of the p-mode excitation and damping processes; and 4) to investigate the properties of the solar atmosphere using oscillations. The overall aim of this work is to use sophisticated helioseismology techniques to discern the internal dynamics of the sun. This in turn tells us about the 11 year variation. Clearly, this is important to solar terrestrial relations.