Rings and trumpets: three-dimensional power spectra of solar oscillations
Rings and trumpets: three-dimensional power spectra of solar oscillations
复制标题
圆环和喇叭：太阳振荡的三维功率谱
DOI：
--
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
F. Hill
中科院分区：
文献类型：
--
作者：
F. Hill
当以恒定的时间频率在太阳表面观测到的多普勒频移的三维功率谱中可见的特征喇叭表面切片时，截面形成环状。对这些环的形状和位置的分析提供了水平流场和光球下面的热力学结构的信息。推导了环的椭圆近似参数与亚光球状态的关系，并进行了数值模拟。对实际数据的初步应用表明，存在着从赤道向南极方向的100米/秒的气流。从不同经度的单个环推断出的速度的比较显示出20-40 m/s的变化，这表明大尺度对流不是方位对称的。40引用。
When slices of characteristic trumpet surfaces visible in three-dimensional power spectra of the Doppler shifts observed on the solar surface are taken at constant temporal frequency, the cross sections form rings. Analysis of the shape and position of these rings provides information on the horizontal flow field and the thermodynamic structure below the photosphere. The relationship between the parameters of an elliptical approximation to the rings and the subphotospheric state is derived, and a numerical simulation is presented. A preliminary application to real data suggests the presence of a flow of 100 m/s directed from the equator toward the south pole. A comparison of the velocities inferred from a single ring obtained at different longitudes shows variations of 20-40 m/s, suggesting that large-scale convection is not azimuthally symmetric. 40 references.