Glossary term: 电离层
Description: 电离层是大气层的一部分（约 80 公里以上）。它含有高浓度的离子，这是由于地球从太阳接收到的高能辐射将分子分解成原子，再将原子分解成离子和电子。自由电子的存在使大气层的这一区域成为良好的导电体。因此，电离层能够反射某些波长的无线电波。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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