ناسا تنشر صورة لظاهرة أرضية نادرة
1007 مشاهدة
عرضت وكالة الفضاء الأميركية "ناسا" صورة نادرة لكوكب الأرض، أثناء دوران محطة الفضاء الدولية (ISS) على ارتفاع يزيد عن 250 ميلا فوق أستراليا.
والتقط رائد فضاء على متن المحطة الفضائية الصورة في السابع من أكتوبر الماضي، ونشرتها ناسا على موقعها الإلكتروني، الثلاثاء الماضي.
تظهر الصورة ظاهرة نادرة تعرف باسم "توهج الهواء"، وهي خطوط ضوئية منتشرة تمتد من 50 إلى 400 ميل في الغلاف الجوي.
تحدث هذه الظاهرة عادة عندما يتم تنشيط الجزيئات (معظمها النيتروجين والأكسجين) بواسطة الأشعة فوق البنفسجية من أشعة الشمس، للإفراج عن تلك الطاقة، وحينها تصطدم الذرات بالغلاف الجوي السفلي ببعضها وتفقد الطاقة عند الاصطدام لتكون النتيجة هي "التوهج الهوائي".
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