Аннотация
The wave equation is solved by the operator separation method proposed in V. V. Zashkvara and N. N. Tyndyk, Zh. Tekh. Fiz. 61 (4), 148 (1991) [Sov. Phys. Tech. Phys. 36 , 456 (1991)]. Solutions describing the evolution of circular-multipole fields are obtained in a cylindrical coordinate system.