Glossary term: 晕
Description: 晕是地球大气中冰晶引起的光学现象。就像水滴中的折射和反射形成彩虹一样，阳光通过冰晶时会在其中发生反射和折射，形成晕。晕可以呈现出多种不同形式，既可以由太阳光引起，也可以由月光引起。其中，22度晕是一种围绕太阳或月亮形成的薄光带圆环。这种晕的几何形状是由阳光或月光通过大气中的冰晶时所产生的特性决定的。
“晕”一词在其他天文学领域中也有使用，包括：星系晕、暗物质晕和恒星晕，它们都是构成星系结构的一些主要组成部分。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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