Alfvén waves have proven to be important in a range of physical systems due to their ability to transport non-thermal energy over long distances in a magnetized plasma. This property is of specific interest in solar physics, where the extreme heating of the atmosphere of the Sun remains unexplained. In an inhomogeneous plasma such as a flux tube in the solar atmosphere, they manifest as incompressible torsional perturbations. However, despite evidence in the upper atmosphere, they have not been directly observed in the photosphere. Here, we report the detection of antiphase incompressible torsional oscillations observed in a magnetic pore in the photosphere by the Interferometric Bidimensional Spectropolarimeter. State-of-the-art numerical simulations suggest that a kink mode is a possible excitation mechanism of these waves. The excitation of torsional waves in photospheric magnetic structures can substantially contribute to the energy transport in the solar atmosphere and the acceleration of the solar wind, especially if such signatures will be ubiquitously detected in even smaller structures with the forthcoming next generation of solar telescopes.

阿尔文波已被证明在一系列物理系统中很重要，因为它们能够在磁化等离子体中长距离传输非热能。这个特性在太阳物理学中特别有趣，太阳大气的极端加热仍然无法解释。在诸如太阳大气中的通量管之类的不均匀等离子体中，它们表现为不可压缩的扭转扰动。然而，尽管在高层大气中有证据，但它们并没有在光球层中直接观察到。在这里，我们报告了通过干涉二维光谱偏振仪在光球中的磁孔中观察到的反相不可压缩扭转振荡的检测。最先进的数值模拟表明，扭结模式是这些波的可能激发机制。