رصدت وكالة الإدارة الوطنية للملاحة الجوية والفضاء “ناسا” توهجات وانفجارات شمسية قوية، حيث من المتوقع أن تصل إلى الأرض اليوم السبت.
وقال الدكتور عباس شراقي، أستاذ الجيولوجيا والموارد المائية بجامعة القاهرة عبر حسابه الشخصي على موقع التواصل الاجتماعي “فيس بوك”: إن الوكالة رصدت انفجارات شمسية قوية درجة X، وهى أشد خمس درجات (A،B،C،M،X) الخميس 28 أكتوبر الجاري، ومتوقع وصول إشعاعها الى الأرض اليوم السبت.
وتابع: “للشمس دورات مدة كل منها 11 سنة فيها تتبادل الموجات الكهرومغناطيسية من الشمال للجنوب، وفى كل دورة يحدث نشاط شمسى قد يبعث بأشعة أكثر تسبب ارتفاعًا فى درجات الحرارة، وقد بدأت الشمس دورتها الحالية 2018، ويبدو أنها دورة نشطة”.
السطح الشمسي
وأضاف: يتميز السطح الشمسي بالنشاط والانفجارات نتيجة تشابك المجالات المغناطيسية بالقرب من البقع الشمسية التى تبدو سوداء لأنها أقل حرارة نسبيًّا (أكثر من 3500 ºم)، ينتج عنها طاقة مفاجئة هائلة تسمى التوهج الشمسي تعادل شدتها 2.5 مليون قنبلة نووية، وهذا ما رصدته ناسا”.
وأردف أستاذ الجيولوجيا والموارد المائية بجامعة القاهرة: يطلق التوهج الشمسي الكثير من الإشعاع في الفضاء الذى يتجه جزء منه نحو الأرض بسرعة 1260 كم/ث، أى تصل إلى سطح الأرض بعد 33 ساعة (السبت) فى رحلة طولها 150 مليون كم هى المسافة بين الشمس والأرض، وأول ما تلتقى بالمناطق التى بها مدارات مئات الأقمار الصناعية وقد تسبب تشويش على الأجهزة الالكترونية مثل الاتصالات اللاسلكية على الأرض، أوالطائرات”.
واختتم قائلًا: “هذا قليل من كثير يحدث فى الشمس أو الأرض سطحها وباطنها، ومع ذلك يخيل للإنسان أنه قادر عليها”.
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