Shadow waves

Shadow waves - also known as running shadows , a low-contrast optical atmospheric phenomenon, which is sometimes visible against the background of light planes 1-3 minutes before the full phase and after the full phase of the solar eclipse . Shadow waves represent light and dark lines (waves), the movement of which is visible against the background of light surfaces. Shadow waves are a consequence of the illumination of the atmosphere with a thin solar sickle approximately 1-2 minutes before and after the complete phase of the solar eclipse. Due to the small angular dimensions of the solar sickle, the refraction of rays in the atmosphere as a result of turbulence causes fluctuations in the intensity of the light flux from the Sun. These fluctuations are visible against a background of light surfaces, similar to how hot heat flows from burners or a bonfire are visible. Dr Stuart Eves of Surrey Satellite Technology Limited (SSTL) hypothesized that shadow waves could be caused by infrasound.