ELECTRIC AND MAGNETIC-FIELDS OF A TOROIDAL DIPOLE IN ARBITRARY MOTION

Electric and magnetic fields of an arbitrarily moving particle possess ing a constant toroidal moment tau are derived from the general soluti on of Maxwell's equations for electric and magnetic fields of a toroid al moment density. The fields divide themselves naturally into five pa rts: the very near fields which vary as 1/R-4 and depend on tau, beta; the near fields which vary as 1/R-3 and depend on tau, beta and (beta ) over dot; the intermediate fields which vary as 1/R-2 and depend on tau, beta, (beta) over dot and <(beta)double over dot>; the far fields which vary as 1/R and depend on tau, beta, (beta) over dot, (beta) do uble over dot and <(beta)triple over dot>; and the delta-terms which r epresent the fields inside the source. The total power radiated by thi s dipole is then calculated for the special case in which the velocity and its derivatives are parallel. (C) 1998 Elsevier Science B.V.