Creeping wave

According to the principle of diffraction, when a wave front passes an obstruction, it spreads out into the shadowed space. A creeping wave, in electromagnetism or acoustics is the wave that is diffracted around the shadowed surface of a smooth body such as a sphere.

Additional recommended knowledge

Don't let static charges disrupt your weighing accuracy

Better weighing performance in 6 easy steps

Daily Sensitivity Test

Creeping waves greatly extend the ground wave propagation of long wavelength (low frequency) radio. They also cause both of a person's ears to hear a sound, rather than only the ear on the side of the head facing the origin of the sound. In radar ranging, the creeping wave return appears to come from behind the target.

Vladimir Fock made important contributions to the understanding and calculation of creeping waves. They are described by Airy functions.