It is shown that the procedure of the multipole current expansion in classic electrodynamics gives rise to (static) current moments of a third type (in addition to charge and magnetic ones) which are called toroid moments. A detailed discussion of their properties is given. The general formula for the expansion of the current in the multipole distributions of all the three types is given. The general expression is also given for the vector-potential of the electromagnetic field induced by a set of multipole distributions of all the types and ranks. Some conceptional consequences of the presence of the two kinds of the sources of the electrical type radiation are discussed.

Разобраны свойства нового мультипольного семейства токовых моментов (тороидных), отличных от зарядовых и магнитных. Указаны принципиальные эффекты и концептуальные изменения, к которым приводит существование этих моментов. Дан полный формализм мультипольных разложений (параметризация тока) в классической и в квантовой теории поля.