{"id":26797,"date":"2025-03-31T12:00:42","date_gmt":"2025-03-31T11:00:42","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=26797"},"modified":"2025-03-26T13:26:47","modified_gmt":"2025-03-26T12:26:47","slug":"preuve-que-les-rayons-cosmiques-declenchent-la-foudre","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/preuve-que-les-rayons-cosmiques-declenchent-la-foudre\/","title":{"rendered":"Preuve que les rayons cosmiques d\u00e9clenchent la foudre"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Via <a href=\"https:\/\/www.spaceweather.com\/archive.php?view=1&#038;day=21&#038;month=03&#038;year=2025\" target=\"_blank\">SpaceWeather.com<\/a> Chaque seconde, pr\u00e8s de 50 \u00e9clairs zigzaguent dans le ciel de la Terre. Malgr\u00e9 des si\u00e8cles d&rsquo;\u00e9tudes, les chercheurs ne savent toujours pas comment les \u00e9clairs se d\u00e9clenchent. Les champs \u00e9lectriques dans les nuages d&rsquo;orage sont souvent trop faibles pour d\u00e9clencher une d\u00e9charge puissante.<\/p>\n<p>Une nouvelle \u00e9tude publi\u00e9e dans le Journal of Geophysical Research, intitul\u00e9e <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/full\/10.1029\/2024JD042549\" target=\"_blank\">3D Radio Frequency Mapping and Polarization Observations Show Lightning Flashes Were Ignited by Cosmic-Ray Showers,<\/a> pourrait avoir r\u00e9solu le myst\u00e8re.<\/p>\n<p>\u00ab Nous pensons que la plupart des \u00e9clairs dans les orages sont d\u00e9clench\u00e9s par des pluies de rayons cosmiques \u00bb, explique l&rsquo;auteur principal de l&rsquo;\u00e9tude, Xuan-Min Shao, chercheur principal au laboratoire national de Los Alamos, au Nouveau-Mexique.<\/p>\n<p>Pour \u00e9tudier les premiers moments de la formation des \u00e9clairs, Shao et ses coll\u00e8gues ont construit un interf\u00e9rom\u00e8tre radio baptis\u00e9 \u00ab BIMAP-3D \u00bb. Constitu\u00e9 d&rsquo;un r\u00e9seau de 8 antennes \u00e0 Los Alamos, BIMAP-3D peut produire des images tridimensionnelles de la foudre et localiser les \u00e9clairs \u00e0 l&rsquo;int\u00e9rieur des nuages d&rsquo;orage. Voici un exemple :<\/p>\n<figure id=\"attachment_26798\" aria-describedby=\"caption-attachment-26798\" style=\"width: 720px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26798\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/preuve-que-les-rayons-cosmiques-declenchent-la-foudre\/flash-plot-lightning\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/Flash-plot-lightning.webp?fit=720%2C490&amp;ssl=1\" data-orig-size=\"720,490\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Flash-plot-lightning\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Les couleurs de l&amp;rsquo;image repr\u00e9sentent le temps. Le bleu repr\u00e9sente les premiers instants du \u00ab\u00a0boulon\u00a0\u00bb, tandis que le rouge indique la fin.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/Flash-plot-lightning.webp?fit=720%2C490&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/Flash-plot-lightning.webp?resize=720%2C490&#038;ssl=1\" alt=\"\" width=\"720\" height=\"490\" class=\"size-full wp-image-26798\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/Flash-plot-lightning.webp?w=720&amp;ssl=1 720w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/Flash-plot-lightning.webp?resize=300%2C204&amp;ssl=1 300w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption id=\"caption-attachment-26798\" class=\"wp-caption-text\">Les couleurs de l&rsquo;image repr\u00e9sentent le temps. Le bleu repr\u00e9sente les premiers instants du \u00ab\u00a0boulon\u00a0\u00bb, tandis que le rouge indique la fin.<\/figcaption><\/figure>\n<p>Il s&rsquo;agit d&rsquo;un \u00e9clair provenant d&rsquo;un orage massif qui est pass\u00e9 pr\u00e8s de Los Alamos le 30 juillet 2022. BIMAP-3D a imag\u00e9 plus de 300 \u00e9clairs pendant les 90 minutes qu&rsquo;a dur\u00e9 l&rsquo;orage. Il s&rsquo;agit d&rsquo;un v\u00e9ritable tr\u00e9sor de donn\u00e9es.<\/p>\n<p>Les exp\u00e9rimentateurs se sont rendu compte que certains des \u00e9clairs observ\u00e9s se produisaient dans des parties de l&rsquo;orage o\u00f9 les champs \u00e9lectriques \u00e9taient trop faibles pour provoquer l&rsquo;\u00ab Initial Breakdown Event \u00bb (IBE), l&rsquo;\u00e9tincelle initiale qui met la foudre en mouvement. Les th\u00e9ories modernes de l&rsquo;avalanche relativiste d&rsquo;\u00e9lectrons ne pouvaient pas expliquer ce qu&rsquo;ils voyaient. Leurs soup\u00e7ons se sont rapidement port\u00e9s sur les rayons cosmiques.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>Les rayons cosmiques sont des particules de haute \u00e9nergie provenant de l&rsquo;explosion de supernovas lointaines et d&rsquo;autres \u00e9v\u00e9nements violents dans le cosmos. Ils frappent constamment l&rsquo;atmosph\u00e8re terrestre, cr\u00e9ant une pulv\u00e9risation secondaire de particules appel\u00e9e \u00ab pluie de rayons cosmiques \u00bb. Les lecteurs r\u00e9guliers connaissent bien ces pluies, car nous les surveillons r\u00e9guli\u00e8rement \u00e0 l&rsquo;aide des ballons \u00e0 rayons cosmiques Earth to Sky qui survolent la Californie.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26799\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/preuve-que-les-rayons-cosmiques-declenchent-la-foudre\/rayons-cosmiques-3\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/rayons-cosmiques.webp?fit=520%2C584&amp;ssl=1\" data-orig-size=\"520,584\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"rayons cosmiques\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/rayons-cosmiques.webp?fit=520%2C584&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/rayons-cosmiques.webp?resize=520%2C584&#038;ssl=1\" alt=\"\" width=\"520\" height=\"584\" class=\"alignnone size-full wp-image-26799\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/rayons-cosmiques.webp?w=520&amp;ssl=1 520w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/03\/rayons-cosmiques.webp?resize=267%2C300&amp;ssl=1 267w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/p>\n<p>L&rsquo;un des aspects importants des pluies de rayons cosmiques est qu&rsquo;elles contiennent de l&rsquo;antimati\u00e8re &#8211; des positrons &#8211; ainsi que des \u00e9lectrons ordinaires. Les cartes d&rsquo;\u00e9clairs en 3D de Los Alamos contiennent des preuves solides de la pr\u00e9sence de positrons. Les \u00e9lectrons et les positrons sont courb\u00e9s dans des directions oppos\u00e9es par le champ magn\u00e9tique terrestre, de sorte qu&rsquo;ils laissent des empreintes oppos\u00e9es sur la polarisation des \u00e9clairs, que BIMAP-3D a \u00e9galement mesur\u00e9e.<\/p>\n<p>\u00ab Il m&rsquo;a fallu un certain temps pour comprendre ce ph\u00e9nom\u00e8ne \u00bb, admet M. Shao. \u00ab Au d\u00e9but, je n&rsquo;ai utilis\u00e9 que des \u00e9lectrons, mais je n&rsquo;arrivais pas \u00e0 expliquer mes observations. Avec les \u00e9lectrons et les positrons, toutes les observations peuvent \u00eatre expliqu\u00e9es de mani\u00e8re coh\u00e9rente.<\/p>\n<p>Les positrons ont permis d&rsquo;\u00e9tablir le bien-fond\u00e9 des rayons cosmiques. \u00ab Le fait qu&rsquo;une pluie de rayons cosmiques fournisse un chemin ionis\u00e9 dans le nuage qui manque autrement d&rsquo;\u00e9lectrons libres favorise fortement la d\u00e9duction que la plupart des \u00e9clairs sont allum\u00e9s par des rayons cosmiques \u00bb, \u00e9crivent les auteurs.<\/p>\n<p>En fait, on ne sait toujours pas quelle proportion des \u00e9clairs terrestres est d\u00e9clench\u00e9e par les rayons cosmiques. Pour am\u00e9liorer les statistiques, il faut \u00e9tudier beaucoup plus d&rsquo;orages avec cette m\u00e9thode. \u00ab Pour ce faire, il faudra disposer d&rsquo;un grand nombre de donn\u00e9es \u00e0 long terme et de bonne qualit\u00e9 sur la foudre \u00bb, pr\u00e9cise M. Shao.<\/p>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\">Terra Projects<\/a><\/p>\n<p>Source : <a href=\"https:\/\/wattsupwiththat.com\/2025\/03\/23\/evidence-found-that-cosmic-rays-spark-lightning\/\" target=\"_blank\">https:\/\/wattsupwiththat.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"26797\">(103)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Via SpaceWeather.com Chaque seconde, pr\u00e8s de 50 \u00e9clairs zigzaguent dans le ciel de la Terre. Malgr\u00e9 des si\u00e8cles d&rsquo;\u00e9tudes, les&#8230;<\/p>\n","protected":false},"author":1,"featured_media":23206,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[32],"tags":[1728,1727,61,368],"class_list":["post-26797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteorologie","tag-eclair","tag-foudre","tag-orage","tag-rayons-cosmiques","wpcat-32-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/10\/foudre.jpg?fit=1024%2C723&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6Yd","jetpack-related-posts":[{"id":1403,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-nouveau-document-suggere-que-les-rayons-cosmiques-declencheraient-la-foudre\/","url_meta":{"origin":26797,"position":0},"title":"Un nouveau document sugg\u00e8re que les rayons cosmiques d\u00e9clencheraient la foudre.","author":"Admin","date":"23 mai 2013","format":false,"excerpt":"Les rayons cosmiques sont cens\u00e9s avoir des effets significatifs sur le climat en augmentant la formation de nuages \u200b\u200bet d'agir comme des amplificateurs de l'activit\u00e9 solaire [la th\u00e9orie de cosmo-climatologie de Svensmark]. Un nouveau document pourrait finalement r\u00e9soudre le myst\u00e8re de ce qui d\u00e9clenche la foudre, on a trouv\u00e9 que\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":19202,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-rayons-cosmiques-declenchent-ils-des-tremblements-de-terre-et-des-eruptions-volcaniques\/","url_meta":{"origin":26797,"position":1},"title":"Les Rayons Cosmiques d\u00e9clenchent-ils des tremblements de terre et des \u00e9ruptions volcaniques ?","author":"Admin","date":"30 mai 2019","format":false,"excerpt":"Les scientifiques ont d\u00e9tect\u00e9 une corr\u00e9lation entre les minima solaires historiques, l'activit\u00e9 volcanique, les taches solaires et le changement climatique. Mais en analysant le concept plus loin, il appara\u00eet que les rayons cosmiques pourraient d\u00e9clencher une activit\u00e9 sismique provoquant des tremblements de terre et des \u00e9ruptions volcaniques. John L Casey\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/05\/volcan-rayon-cosmique.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/05\/volcan-rayon-cosmique.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/05\/volcan-rayon-cosmique.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/05\/volcan-rayon-cosmique.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/05\/volcan-rayon-cosmique.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":4070,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-ouragans-peuvent-etre-predits-depuis-lethiopie\/","url_meta":{"origin":26797,"position":2},"title":"Des ouragans peuvent \u00eatre pr\u00e9dits depuis l&rsquo;Ethiopie","author":"Admin","date":"13 juillet 2007","format":false,"excerpt":"Voici une d\u00e9couverte d'un scientifique isra\u00e9lien. Il se pourrait que l'on puisse pr\u00e9dire les ouragans qui frappent les am\u00e9riques 3 semaines avant. Pour mieux pr\u00e9dire la formation et la force des ouragans qui s\u00e9vissent sur l\u2019oc\u00e9an Atlantique et les Cara\u00efbes, les m\u00e9t\u00e9orologistes devraient regarder de plus pr\u00e8s l\u2019activit\u00e9 orageuse au-dessus\u2026","rel":"","context":"Dans &quot;Ev\u00e8nement Brutal&quot;","block_context":{"text":"Ev\u00e8nement Brutal","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/evenement-brutal\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2007\/07\/katrina_screengrab_cnn.jpg?fit=400%2C300&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":8426,"url":"https:\/\/www.laterredufutur.com\/accueil\/impressionnant-orage-qui-illumine-le-ciel-par-des-eclairs-fabuleux\/","url_meta":{"origin":26797,"position":3},"title":"Impressionnant orage qui illumine le ciel par des \u00e9clairs fabuleux","author":"Admin","date":"28 septembre 2015","format":false,"excerpt":"Voici une video impressionnante et exceptionnelle de la foudre qui vient dessiner le ciel de la nuit. En remerciant\u00a0Aurel Y.\u00a0de nous avoir transmis le lien de cette video.","rel":"","context":"Dans &quot;M\u00e9t\u00e9orologie&quot;","block_context":{"text":"M\u00e9t\u00e9orologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/meteorologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/foudre-eclair.jpg?fit=705%2C547&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/foudre-eclair.jpg?fit=705%2C547&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/foudre-eclair.jpg?fit=705%2C547&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/09\/foudre-eclair.jpg?fit=705%2C547&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1376,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-terre-et-la-foudre\/","url_meta":{"origin":26797,"position":4},"title":"La Terre et la Foudre","author":"Admin","date":"14 mai 2013","format":false,"excerpt":"Lorsque le champ \u00e9lectrostatique d\u00e9passe les limites di\u00e9lectriques de l'air (variables selon les conditions d'humidit\u00e9 et de pression), il s'ensuit la d\u00e9charge de foudre conduisant \u00e0 un r\u00e9-\u00e9quilibre \u00e9lectrostatique : le traceur ou pr\u00e9curseur, transportant une faible charge \u00e9lectrique, avance vers une zone de charge oppos\u00e9e \u00e0 une vitesse de\u2026","rel":"","context":"Dans &quot;M\u00e9t\u00e9orologie&quot;","block_context":{"text":"M\u00e9t\u00e9orologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/meteorologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/img.youtube.com\/vi\/m2kZr9Fs3Yc\/0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":6828,"url":"https:\/\/www.laterredufutur.com\/accueil\/un-nuage-dantimatiere-decouvert-au-coeur-dun-orage\/","url_meta":{"origin":26797,"position":5},"title":"Un nuage d&rsquo;antimati\u00e8re d\u00e9couvert au coeur d&rsquo;un orage","author":"Admin","date":"7 juin 2015","format":false,"excerpt":"C\u2019est en voulant \u00e9tudier les rayons gamma dans l\u2019atmosph\u00e8re qu\u2019un avion scientifique est rentr\u00e9 dans un nuage de positrons, des particules d\u2019antimati\u00e8re, au sein m\u00eame d\u2019un violent orage. 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