the ionosphere
noun [ S ] environment specialized uk/aɪˈɒn.əˌsfɪər/ us/aɪˈɑː.nəˌsfɪr/
电离层
the part of the earth's atmosphere, from about 60 kilometres to about 1,000 kilometres above the surface, in which there are many ions
Compare: the exospherethe mesospherethe stratosphere the thermospherethe troposphere