| 释义 |
magnetosphere|mægˈniːtəʊsfɪə(r)|
[f. magneto- + sphere n.]
The region surrounding the earth or a heavenly body in which its magnetic field is effective and prevails over magnetic fields due to other causes (in the case of the earth not spherical but much elongated on the side away from the sun).
1959T. Gold in Jrnl. Geophysical Res. LXIV. 1219/1 The region above the ionosphere in which the magnetic field of the earth has a dominant control over the motions of gas and fast charged particles..is known to extend out to a distance of the order of 10 earth radii; it may appropriately be called the magnetosphere. 1962Flight Internat. LXXXI. 222 Instead of distinct inner and outer [radiation] belts, the picture now appears to be of one large region in which particles of different characteristics are trapped. Different types of particles have been observed at 1½ Earth radii (from the centre of the Earth), three radii, four radii (the older concept of the outer belt) and between six radii and the outer edge of the magnetosphere, as the region is now known. The outer limit varies from day to day but is at approximately 8–12 Earth radii. 1967New Scientist 26 Jan. 198/1 Like the Earth, Jupiter is expected to have a ‘magnetosphere’ with a ‘tail’ pushed away from it by the solar wind. 1971I. G. Gass et al. Understanding Earth xviii. 260/1 The Van Allen belts are zones of stably trapped particles within the magnetosphere. 1971Nature 13 Aug. 443/3 Much work needs to be done to investigate the kinds of plasma instabilities that can occur in the magnetospheres of neutron stars.
Hence magnetoˈspheric a.
1961New Scientist 19 Jan. 167/2 What have been termed ‘magnetospheric waveguides’ may provide new methods of radio communication between the northern and southern hemispheres. 1969Physics Bull. June 223/1 Instabilities..occur in both laboratory and magnetospheric and interplanetary plasmas. 1974McGraw-Hill Yearbk. Sci. & Technol. 277/2 The so-called whistlers in the kilohertz frequency range, as well as the long-period waves,..have become important tools in magnetospheric exploration both from the ground and from satellites. |