TY - JOUR AU - Fernández-Rañada, Antonio PY - 1997 DO - 10.1016/S0375-9601(97)00366-6 SN - 0375-9601 UR - https://hdl.handle.net/20.500.14352/58981 T2 - Physics Letters A AB - We prove two properties of the electromagnetic knots in empty space. First, that any standard radiation fields (i.e. satisfying E . B = 0) coincide locally with an electromagnetic knot. Second, that the electric and magnetic helicities of any knot are... LA - eng M2 - 25 PB - Elsevier KW - Electromagnetic Field KW - Topological Field KW - Knot KW - Helicity KW - Link. TI - Two properties of electromagnetic knots TY - journal article VL - 232 ER -