{"id":21749,"date":"2025-11-12T09:03:38","date_gmt":"2025-11-12T08:03:38","guid":{"rendered":"https:\/\/reperes-astro.fr\/?p=21749"},"modified":"2026-02-08T12:34:24","modified_gmt":"2026-02-08T11:34:24","slug":"12-novembre-aurores-boreales-en-picardie","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/12-novembre-aurores-boreales-en-picardie\/","title":{"rendered":"Aurores bor\u00e9ales en Picardie"},"content":{"rendered":"\n

Comment est il possible de voir des aurores bor\u00e9ales en Picardie ? D\u00e9j\u00e0 il faut comprendre comment ce ph\u00e9nom\u00e8ne est provoqu\u00e9.<\/p>\n\n\n\n

Formation des Aurores Bor\u00e9ales<\/span><\/strong>.<\/h2>\n\n\n\n

Tout d’abord il faut une \u00e9ruption solaire<\/a> ou un sursaut solaire<\/a> important qui provoque un afflux de particules<\/a> charg\u00e9es, \u00e9ject\u00e9es par le Soleil<\/a>, ces particules entre en collision avec le bouclier que constitue la magn\u00e9tosph\u00e8re<\/a> provoquant ainsi un orage magn\u00e9tique<\/a>.<\/p>\n\n\n\n

Les particules \u00e9lectris\u00e9es \u00e0 haute \u00e9nergie peuvent alors \u00eatre capt\u00e9es et canalis\u00e9es par les lignes du champ magn\u00e9tique terrestre<\/a> du c\u00f4t\u00e9 nuit de la magn\u00e9tosph\u00e8re (la queue) et aboutir dans une zone appel\u00e9e ovale auroral<\/em>.<\/p>\n\n\n\n

Ces particules \u2014 \u00e9lectrons<\/a>, protons<\/a> et ions<\/a> positifs excitent ou ionisent les atomes<\/a> de la haute atmosph\u00e8re, l’ionosph\u00e8re<\/a>. L’atome excit\u00e9 ne peut rester dans cet \u00e9tat, et un \u00e9lectron change alors de couche, lib\u00e9rant au passage un peu d’\u00e9nergie, en \u00e9mettant un photon<\/a> (particule \u00e9l\u00e9mentaire<\/a> constitutive de la lumi\u00e8re visible<\/a>).<\/p>\n\n\n\n

Comme la nature des gaz composant l’atmosph\u00e8re (oxyg\u00e8ne<\/a>, hydrog\u00e8ne<\/a>, azote<\/a>, etc.) d\u00e9pend de l’altitude, ceci explique en partie les variations de teintes des nuages, draperies, rideaux, arcs, rayons\u2026 qui se d\u00e9ploient dans le ciel \u00e0 des altitudes comprises entre 80 et 1 000 km.<\/p>\n\n\n\n

Source : Wikip\u00e9dia<\/a><\/strong><\/p>\n\n\n\n

Pour nous tout a commenc\u00e9 le mardi 11 Novembre avec un message de la part d’Axel :<\/strong><\/p>\n\n\n

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Une tr\u00e8s forte \u00e9ruption solaire a eu lieu ce matin, de classe X 5.16. N’h\u00e9sitez pas \u00e0 contacter Claude, Maxence ou moi-m\u00eame si vous souhaitez vous rattacher au groupe Observateurs solaires.<\/p>\n<\/blockquote>\n\n\n\n

Pour info, Les classes sont nomm\u00e9es A, B, C, M et X. Chaque classe correspond \u00e0 une \u00e9ruption solaire d’une intensit\u00e9 dix fois sup\u00e9rieure \u00e0 la pr\u00e9c\u00e9dente, o\u00f9 la classe X correspond aux \u00e9ruptions solaires ayant une intensit\u00e9 de 10\u22124<\/sup> W\/m2<\/sup>. Au sein d’une m\u00eame classe, les \u00e9ruptions solaires sont class\u00e9es de 1 \u00e0 10 selon une \u00e9chelle lin\u00e9aire (ainsi, une \u00e9ruption solaire de classe X2 est deux fois plus puissante qu’une \u00e9ruption de classe X1, et quatre fois plus puissante qu’une \u00e9ruption de classe M5).<\/p>\n\n\n\n

Cette grosse \u00e9ruption promettait une envol\u00e9e de l’indice Kp.<\/p>\n\n\n

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Qu’est ce que l’indice Kp<\/span> ?<\/strong><\/h2>\n\n\n\n

L\u2019indice Kp<\/strong> (Kp index ou Planetary K-index<\/strong>) est souvent utilis\u00e9 pour d\u00e9terminer la probabilit\u00e9 de voir les aurores polaires ou bor\u00e9ales. C\u2019est aussi l\u2019un des indices les plus couramment utilis\u00e9s pour indiquer la gravit\u00e9 des perturbations magn\u00e9tiques mondiales dans l\u2019espace proche de la Terre. Gradu\u00e9 de 0 (tr\u00e8s faibles perturbations) \u00e0 9 (perturbations extr\u00eames).<\/p>\n\n\n\n

Au del\u00e0 de 7 des aurores peuvent \u00eatre visibles jusqu’\u00e0 nos latitudes.<\/p>\n\n\n\n

A 4h du matin le 12 Novembre, l’indice Kp \u00e9tait de 8.67, et ce fut le cas toute la journ\u00e9e, ce qui nous permettait d’esp\u00e9rer un beau spectacle!<\/p>\n\n\n\n

Et en effet, pour les quelques courageux(ses) qui se sont r\u00e9veill\u00e9(e)s de bonne heure pour prendre d’\u00e9ventuels clich\u00e9s, le moins que l’on puisse dire c’est qu’il n’y a pas eu de d\u00e9ception !<\/p>\n\n\n\n

Voici plusieurs images que nous avons r\u00e9colt\u00e9 :<\/p>\n\n\n\n

Merci \u00e0 Arnaud, Didier, Fred, Geoffrey, Laetitia et Louisette.<\/p>\n\n\n\n

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Encore une belle soir\u00e9e le 20 janvier 2026 avec nombreux partages malgr\u00e9 un ciel bien nuageux.<\/strong><\/p>\n\n\n\n

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St\u00e9phane vous propose un petit compte rendu de cette soir\u00e9e remarquable \ud83d\ude09. Disponible ICI<\/a><\/strong><\/p>\n\n\n\n

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Comment est il possible de voir des aurores bor\u00e9ales en Picardie ? D\u00e9j\u00e0 il faut comprendre comment ce ph\u00e9nom\u00e8ne est provoqu\u00e9....<\/p>\n

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<\/div>\n","protected":false},"author":2,"featured_media":21774,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57,64,49],"tags":[],"class_list":["post-21749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aurores-et-autres-evenements","category-astromomes","category-informations-a-destination-des-enseignants-et-des-animateurs"],"a3_pvc":{"activated":true,"total_views":111,"today_views":1},"yoast_head":"Aurores bor\u00e9ales en Picardie - Rep\u00e8res Astro<\/title>\n<meta name=\"description\" content=\"Comment est il possible de voir des aurores bor\u00e9ales en Picardie ? 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