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Nos Aurores Boreales

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Nos Aurores Boreales

  1. 1. Nos Aurores Boréales Composé par: Carl Orff , en 1936 Executé par: L’orchestre Symphonique de Boston Musique de: Carmina Burana
  2. 15. Depuis que le monde est monde, les aurores polaires font partie intégrante de notre planète Terre. Elles ne dépendent aucunement de l'activité humaine, mais plutôt de celle du Soleil et du champ magnétique terrestre! L'aurore n'est pas, tel qu'on l'a cru pendant longtemps (jusqu'à il y a 70 ans), causée pas la réflexion de la lumière solaire sur les glaces de l'Arctique.   Toutefois, c'est effectivement le soleil qui est responsable des aurores polaires. La surface turbulente du soleil rejette dans l'espace des atomes et des particules subatomiques (protons, électrons). Lors de violentes tempêtes solaires, une grande quantité d'électrons et de protons venant du soleil arrivent dans l'atmosphère terrestre et excitent les atomes d'oxygène et d'azote, lesquels deviennent subitement lumineux et produisent les magnifiques voiles (rubans ou rideaux) de lumière colorée que sont les aurores polaires. On les nomme polaires parce qu'une fois arrivées dans l'atmosphère terrestre, les particules sont prises au piège par le champ magnétique qui les force à se diriger vers les pôles magnétiques nord (aurore boréale) et sud (aurore australe).   L'aurore a la forme d'une mince bande elliptique - l'ovale auroral - centrée sur les pôles nord et sud magnétiques, i.e. environ à 700 mètres des pôles géographiques. La grandeur de cette forme dépend de l'activité solaire: plus le Soleil est "silencieux" et le vent solaire calme, moins l'ovale est grand; contrairement, plus le vent solaire frappe le champ magnétique terrestre avec force et rafale, plus l'aurore devient large et s'étend. A urore du nord au sud ! Les A urores B oréales
  3. 23. Aparté du système solaire <ul><li>La température de l'atmosphère solaire est de plusieurs millions de degrés Kelvin (Température °C = Température °K - 273,15). </li></ul><ul><li>À ces températures, les collisions entre les particules sont si violentes que les atomes d'hydrogène se décomposent en électrons et en protons. Ce &quot;matériel&quot; ionisé est appelé plasma. </li></ul><ul><li>Le vent solaire, c'est lorsque ce plasma s'éloigne du soleil dans toutes les directions. Il transporte le champ magnétique solaire dans l'espace interplanétaire. La vitesse et la densité de ce vent solaire varie beaucoup; celles-ci sont plus grandes quand le vent provient des régions actives du soleil, comme les taches ou les protubérances solaires. </li></ul>
  4. 28. Fin

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