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Glossary term: قوس قزح

Also known as أقوس الألوان أو قوس المطر

Description: القوس الكبير المتعدد الألوان الذي يظهر في السماء عادة بعد هطول الأمطار، يُسمى قوس قزح. يتألف من شرائط متحدة المركز بألوان البنفسجي، النيلي، الأزرق، الأخضر، الأصفر، البرتقالي، والأحمر. ويرى المشاهد قوس قزح عندما تكون الشمس في ظهره.
يحدث قوس قزح بسبب انكسار ضوء الشمس الأبيض عبر قطرات الماء الصغيرة في الهواء، ما يحلله إلى ألوان الطيف، وهي نفس العملية التي تحدث في المنشور الزجاجي. وفي قوس قزح العادي، ينعكس الضوء داخل قطرات الماء مرة واحدة ويتشتت من خلال الانكسار.
في بعض الأحيان، يمكن رؤية قوسين قزح متداخلين، حيث تكون ألوان القوس الثاني بترتيب معكوس. يُسمى القوس الداخلي الأكثر سطوعاً بالقوس الرئيسي، بينما يُسمى القوس الخارجي الباهت بالقوس الثانوي. ظاهرة قوس قزح المزدوج نادرة نسبيا. ويحدث قوس قزح الثانوي عندما ينعكس الضوء مرتين داخل قطرات الماء بالإضافة إلى انكساره.

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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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