the ionosphere
noun[S]
environmentspecializeduk/aɪˈɒn.əˌsfɪər/us/aɪˈɑː.nəˌsfɪr/thepartof the earth'satmosphere, from about 60kilometresto about 1,000kilometresabove thesurface, in which there are manyions
电离层
Compare
the exosphere
the mesosphere
the stratospherespecialized
the thermosphere
the troposphere