{"id":11158,"date":"2019-09-08T06:20:11","date_gmt":"2019-09-08T06:20:11","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11158"},"modified":"2021-09-19T08:10:36","modified_gmt":"2021-09-19T08:10:36","slug":"steve-le-mysterieux-ruban-lumineux-est-de-retour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/08\/steve-le-mysterieux-ruban-lumineux-est-de-retour\/","title":{"rendered":"STEVE, le myst\u00e9rieux ruban lumineux violet, est de retour"},"content":{"rendered":"<p><strong>Photographi\u00e9 depuis quelques ann\u00e9es par des chasseurs d\u2019aurores, un curieux ruban de plasma surnomm\u00e9 STEVE intrigue les scientifiques.<\/strong><\/p>\n<h5>Une d\u00e9couverte r\u00e9cente :<\/h5>\n<p>Tout a commenc\u00e9 en 2016 lorsque des membres du<a href=\"https:\/\/fr-fr.facebook.com\/groups\/AlbertaAuroraChasers\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em> Alberta Aurora Chasers<\/em><\/a> (un groupe de chasseurs d\u2019<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/29\/video-drone-filme-aurores-boreales-islandaises\/\" target=\"_blank\" rel=\"noopener noreferrer\">aurores bor\u00e9ales<\/a>), ont partag\u00e9 sur les r\u00e9seaux sociaux leurs clich\u00e9s d\u2019un curieux ph\u00e9nom\u00e8ne. Ils avaient enregistr\u00e9 un arc de plasma scintillant, de couleur violette, qui s\u2019invitait sur leurs images d\u2019aurores polaires. Ce ruban lumineux \u00e9tait syst\u00e9matiquement accompagn\u00e9 \u00e0 sa base d\u2019une barri\u00e8re verte semblable aux draperies que l\u2019on observe dans certaines aurores. Le ph\u00e9nom\u00e8ne a de nouveau \u00e9t\u00e9 photographi\u00e9 le 15 septembre 2021 en Norv\u00e8ge par <a href=\"https:\/\/spaceweathergallery.com\/indiv_upload.php?upload_id=177907\" target=\"_blank\" rel=\"noopener\">Markus Varik<\/a>.<\/p>\n<figure id=\"attachment_14729\" aria-describedby=\"caption-attachment-14729\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1.jpg\" rel=\"lightbox[11158]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14729\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/09\/steve-1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14729\" class=\"wp-caption-text\">STEVE est bien visible sur cette image prise le 15 septembre en Norv\u00e8ge. @ Markus Varik<\/figcaption><\/figure>\n<p>Depuis cinq ans, les scientifiques se sont pench\u00e9s sur le ph\u00e9nom\u00e8ne, qu&#8217;ils ont surnomm\u00e9 STEVE, et\u00a0 commencent \u00e0 \u00e9lucider quelques-uns de ses myst\u00e8res. <!--more--><\/p>\n<h5>Deux satellites traquent STEVE :<\/h5>\n<p>Ils ont d\u2019abord conserv\u00e9 son nom et en ont fait un acronyme\u00a0: <em>Strong Thermal Emission Velocity Enhancement<\/em> (qui peut se traduire par forte acc\u00e9l\u00e9ration de la vitesse d\u2019\u00e9mission thermique). Ils ont ensuite mobilis\u00e9 deux satellites pour traquer ce ruban lumineux. Le premier est l\u2019un des mini-satellites de la mission europ\u00e9enne <a href=\"http:\/\/www.ipgp.fr\/fr\/mission-swarm\" target=\"_blank\" rel=\"noopener noreferrer\">SWARM<\/a> (qui signifie essaim en anglais). Ces derniers sont charg\u00e9s d\u2019\u00e9tudier les variations du champ magn\u00e9tique terrestre.<\/p>\n<figure id=\"attachment_8278\" aria-describedby=\"caption-attachment-8278\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3.jpg\" rel=\"lightbox[11158]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-8278\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-450x300.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-768x512.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-1024x683.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3.jpg 1350w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-8278\" class=\"wp-caption-text\">Une aurore bor\u00e9ale se d\u00e9ploie pour la grande joie d&#8217;un photographe. \u00a9 The Aurora Chasers<\/figcaption><\/figure>\n<p>Le second appartient \u00e0 la mission <a href=\"https:\/\/www.nasa.gov\/mission_pages\/themis\/mission\/index.html\" target=\"_blank\" rel=\"noopener noreferrer\">THEMIS<\/a> (<em>Time History of Events and Macroscale Interactions during Substorms<\/em>). Cette mission comprend un ensemble de cinq satellites qui traquent les aurores bor\u00e9ales. Les donn\u00e9es recueillies, qui ont fait l\u2019objet de plusieurs publications, ont permis de mieux comprendre ce qu&#8217;on observait.<\/p>\n<h5>Fausse aurore polaire :<\/h5>\n<p>On sait maintenant que si STEVE ressemble \u00e0 une aurore polaire, ce n\u2019en est cependant pas une. Le ph\u00e9nom\u00e8ne, qui est double, prend naissance au cours d\u2019explosions magn\u00e9tiques appel\u00e9es &#8220;sous- orages&#8221; qui se produisent \u00e0 plus de 22.000 kilom\u00e8tres de la surface terrestre. Il y d\u2019abord formation d\u2019un ruban de gaz chaud (un flux de plasma \u00e0 3.000\u00b0 C) qui traverse la magn\u00e9tosph\u00e8re terrestre \u00e0 des vitesses sup\u00e9rieures \u00e0 6 km\/s. Parvenu \u00e0 une altitude d&#8217;environ 250 kilom\u00e8tres, il commence \u00e0 \u00e9mettre une lumi\u00e8re mauve : c\u2019est le fameux ruban lumineux.<\/p>\n<p><iframe loading=\"lazy\" title=\"Northern Lights shot with a Drone\" src=\"https:\/\/player.vimeo.com\/video\/180028553?dnt=1&amp;app_id=122963\" width=\"474\" height=\"267\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p>Ces explosions magn\u00e9tiques produisent \u00e9galement des flots de particules \u00e9nerg\u00e9tiques qui s\u2019enfoncent encore plus profond\u00e9ment dans l&#8217;atmosph\u00e8re. Vers 100 km d\u2019altitude, elles deviennent visibles sous la forme d\u2019une draperie verte, la barri\u00e8re lumineuse qui accompagne le ruban. Pour les scientifiques, STEVE existe en fait depuis longtemps ; on doit son observation r\u00e9cente \u00e0 la sensibilit\u00e9 croissante des bo\u00eetiers photographiques.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/26\/islande-aurore-boreale-au-dessus-du-geldingadalur-en-eruption\/\" target=\"_blank\" rel=\"noopener\">Islande : aurore bor\u00e9ale sur le Geldingadalur en \u00e9ruption<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/27\/en-suede-une-aurore-boreale-danse-derriere-un-halo-lunaire\/\" target=\"_blank\" rel=\"noopener\">En Su\u00e8de, une aurore bor\u00e9ale danse derri\u00e8re un halo lunaire<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/11\/un-pilote-de-ligne-filme-la-danse-des-aurores-boreales\/\" target=\"_blank\" rel=\"noopener\">Un pilote de ligne filme la danse des aurores bor\u00e9ales<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Photographi\u00e9 depuis quelques ann\u00e9es par des chasseurs d\u2019aurores, un curieux ruban de plasma surnomm\u00e9 STEVE intrigue les scientifiques. Une d\u00e9couverte r\u00e9cente : Tout a commenc\u00e9 en 2016 lorsque des membres du Alberta Aurora Chasers (un groupe de chasseurs d\u2019aurores bor\u00e9ales), ont partag\u00e9 sur les r\u00e9seaux sociaux leurs clich\u00e9s d\u2019un curieux ph\u00e9nom\u00e8ne. Ils avaient enregistr\u00e9 un &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/08\/steve-le-mysterieux-ruban-lumineux-est-de-retour\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">STEVE, le myst\u00e9rieux ruban lumineux violet, est de retour<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":14729,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[395,2714,2716,2325],"class_list":["post-11158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-aurore-boreale","tag-steve","tag-swarm","tag-themis"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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