| 单词 | poloidal |
| 释义 | poloidal, a.|pəˈlɔɪdəl|
[f. polar a. (n.) + toroidal a.]
Being or representing a magnetic field of the form associated with a circular current loop, in which each line of force is confined to a radial or meridian plane.
1946W. M. Elsasser in Physical Rev. LXIX. 108/1 We shall now introduce names for these three types of vectors. They will be designated as scaloidal (U), toroidal (T), and poloidal (S) vector fields. The electric field and vector potential pertaining to a poloidal magnetic field are toroidal, and vice versa. 1967McGraw-Hill Yearbk. Sci. & Technol. 225 The magnetic field at the Earth's surface has a radial component and is thus of the poloidal type. 1972Sci. Amer. July 67/3 A toroidal electric field maintains a toroidal current that flows inside the plasma, and this current in turn generates a magnetic-field component that is poloidal... The combination of the poloidal field with the toroidal field produces helical magnetic-field lines that lie on closed magnetic surfaces (nested toroids of circular cross section). 1973Nature 20 Apr. 516/2 There are on the Moon weak, local, fairly randomly oriented magnetic fields but no overall poloidal field. |
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