It occurs when an electromagnetic field in a local medium is disrupted, releasing photons that constructively interfere and is often considered an analogue of a sonic boom.
The Askaryan effect can generate this phenomenon, whose alteration by a periodic grating is the Smith-Purcell effect. Hankel functions were utilized by Ilya Frank and Igor Tamm to develop a formula calculating the intensity of this effect. It occurs when an electromagnetic field in a local medium is disrupted, releasing photons that constructively interfere and is often considered an analogue of a sonic boom. For 10 points, name this effect named for its Russian discoverer which occurs when particles propagate faster than the local speed of light through a medium, generating an oft-seen blue color.
The Askaryan effect can generate this phenomenon, whose alteration by a periodic grating is the Smith-Purcell effect.
Cherenkov radiation /effect