TY JOUR TI Toroidal models of magnetic field with twisted structure KW magnetic flux rope models KW force-free magnetic field KW magnetic field lines KW toroidal magnetic field KW magnetic cloud JO Solnechno-Zemnaya Fizika AU Petukhova, A.S. AU Petukhov, S.I. PY 2019 IS 5 PB INFRA-M Academic Publishing LLC.