A reliable inference of the differential rotation rate of the solar photosphere is essential for models of the solar interior. The work presented here is based on a novel iterative phase correlation technique, which relies on the measurement of the local shift, at the central meridian, between two images separated by a given time interval. Consequently, it does not require any specific reference features, such as sunspots or supergranules, nor extended observations spanning several months. The reliability of the method is demonstrated by applying it to high spatial and temporal resolution continuum images of the solar photosphere, at 6173 Å, acquired by the Solar Dynamics Observatory Helioseismic and Magnetic Imager over one complete Carrington rotation. The data selected covers the time period of 2020 January1 to February2. The method was applied to one day, and to the full time interval. The differential rotation rate derived using this feature-independent technique yields values that fall in the middle of the range of those published to date. Most importantly, the method is suited for the production of detailed rotation maps of the solar photosphere. It also enables the visual and quantitative identification of the north–south asymmetry in the solar differential rotation rate, when present.

对太阳光球层不同旋转速率的可靠推断对于太阳内部模型至关重要。此处介绍的工作基于一种新颖的迭代相位相关技术，该技术依赖于对以给定时间间隔分隔的两幅图像之间在中央子午线上的局部偏移的测量。因此，它不需要任何特定的参考特征，例如太阳黑子或超粒子，也不需要跨越数月的长时间观测。该方法的可靠性通过将其应用于太阳动力学天文台日震和磁成像仪在一次完整的卡林顿旋转中获得的 6173 Å 的太阳光球层的高空间和时间分辨率连续谱图像来证明。所选数据涵盖2020年1月1日至2月2日的时间段。该方法适用于一天和整个时间间隔。使用这种与特征无关的技术得出的差速旋转率产生的值落在迄今为止公布的范围的中间。最重要的是，该方法适用于制作太阳光球层的详细旋转图。它还可以在存在时对太阳差异旋转速率的南北不对称进行视觉和定量识别。