{"id":15835,"date":"2022-04-23T11:20:11","date_gmt":"2022-04-23T11:20:11","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15835"},"modified":"2022-05-05T16:49:27","modified_gmt":"2022-05-05T16:49:27","slug":"un-grand-groupe-de-taches-solaires-devient-visible-a-loeil-nu","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/04\/23\/un-grand-groupe-de-taches-solaires-devient-visible-a-loeil-nu\/","title":{"rendered":"Un grand groupe de taches solaires devient visible \u00e0 l&#8217;\u0153il nu"},"content":{"rendered":"<p><strong>L&#8217;activit\u00e9 solaire s&#8217;intensifie, la preuve avec un grand groupe de taches que l&#8217;on peut suivre \u00e0 l&#8217;\u0153il nu en prenant certaines pr\u00e9cautions.<\/strong><\/p>\n<h5>Un groupe qui prend de l&#8217;ampleur :<\/h5>\n<p>Apparu le 17 avril, le groupe de taches solaires <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/04\/18\/ar-2993-94-un-beau-groupe-de-taches-solaires-a-suivre\/\" target=\"_blank\" rel=\"noopener\">AR 2993-94<\/a> s&#8217;\u00e9tend de plus en plus. Il compte d\u00e9sormais quatre ensembles num\u00e9rot\u00e9s de 2993 \u00e0 2996, comme on peut le constater sur les images propos\u00e9es quotidiennement sur des sites comme\u00a0<a href=\"https:\/\/spaceweather.com\/\" target=\"_blank\" rel=\"noopener\"><em>SpaceWeather<\/em><\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2.jpg\" rel=\"lightbox[15835]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-15837\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2-1022x1024.jpg 1022w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2-768x769.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires2.jpg 1078w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;observation des taches solaires est une activit\u00e9 passionnante \u00e0 condition de bien prot\u00e9ger son t\u00e9lescope par un filtre appropri\u00e9. Je vous recommande la lecture de\u00a0l\u2019article que j\u2019ai consacr\u00e9 \u00e0 ce sujet il y a quelques semaines :\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/28\/comment-observer-lactivite-solaire-en-toute-securite\/\" target=\"_blank\" rel=\"noopener\"><em>Comment observer l\u2019activit\u00e9 solaire en toute s\u00e9curit\u00e9<\/em><\/a>.<\/p>\n<figure id=\"attachment_15015\" aria-describedby=\"caption-attachment-15015\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1.jpg\" rel=\"lightbox[15835]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15015\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/sol1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15015\" class=\"wp-caption-text\">L&#8217;observation du Soleil n\u00e9cessite l&#8217;emploi d&#8217;un filtre adapt\u00e9. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<h5>Spectacle filtr\u00e9 :<\/h5>\n<p>Mais comme ce groupe de taches est d\u00e9sormais assez \u00e9tendu pour \u00eatre visible \u00e0 l&#8217;\u0153il nu, vous pouvez aussi utiliser des lunettes pr\u00e9vues pour l&#8217;observation des \u00e9clipses de Soleil :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/lunettes-eclipse.jpg\" rel=\"lightbox[15835]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1978\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/lunettes-eclipse-450x324.jpg\" alt=\"\" width=\"450\" height=\"324\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/lunettes-eclipse-450x324.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/lunettes-eclipse-1024x737.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/lunettes-eclipse.jpg 1250w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Le photographe polonais <a href=\"https:\/\/www.instagram.com\/marek.nikodem.niki\/\" target=\"_blank\" rel=\"noopener\">Marek Nikodem<\/a> a, de son c\u00f4t\u00e9, r\u00e9alis\u00e9 un tr\u00e8s beau clich\u00e9 de ce spectacle avec un t\u00e9l\u00e9objectif de 600 millim\u00e8tres de focale le 21 avril. De telles photographies sont possibles sans filtre au moment du lever ou du coucher du Soleil :<\/p>\n<figure id=\"attachment_15836\" aria-describedby=\"caption-attachment-15836\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires.jpg\" rel=\"lightbox[15835]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15836\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/04\/taches_solaires.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15836\" class=\"wp-caption-text\">Le grand groupe de taches solaires photographi\u00e9 le 21 avril. \u00a9 Marek Nikodem<\/figcaption><\/figure>\n<p>La lumi\u00e8re solaire est alors suffisamment att\u00e9nu\u00e9e par l&#8217;absorption atmosph\u00e9rique (qui joue le r\u00f4le du filtre). Dans ce cas, on peut r\u00e9aliser des images avec des vitesses d&#8217;obturation tr\u00e8s rapides (pour ne pas endommager le capteur \u00e9lectronique de l&#8217;appareil).<\/p>\n<h5>\u00c0 savoir :<\/h5>\n<p>Les taches solaires sont des zones sombres dans lesquelles r\u00e8gne une intense activit\u00e9 magn\u00e9tique. Leur apparition n\u2019est pas r\u00e9guli\u00e8re. Elle se fait selon un cycle d\u2019environ 11 ans, mis en \u00e9vidence par l\u2019astronome suisse Johann Rudolph Wolf (1816-1893). Ces taches sont num\u00e9rot\u00e9es dans l\u2019ordre d\u2019apparition par la <a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">NOAA<\/a>. Le num\u00e9ro est pr\u00e9c\u00e9d\u00e9 des lettres AR qui signifient\u00a0<em>Active Region<\/em>. Le cycle actuel est le vingt-cinqui\u00e8me depuis 1755. C\u2019est en effet \u00e0 partir de cette date que les astronomes se sont mis \u00e0 compter syst\u00e9matiquement les taches solaires. Ce cycle devrait atteindre son maximum en 2025.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/26\/uy-scuti-la-supergeante-1-700-fois-plus-grande-que-le-soleil\/\" target=\"_blank\" rel=\"noopener\">UY Scuti, la superg\u00e9ante 1.700 fois plus grande que le Soleil<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/26\/solarigraphe-revele-soleil-dun-solstice-a-lautre\/\" target=\"_blank\" rel=\"noopener\">Un solarigraphe r\u00e9v\u00e8le le Soleil d\u2019un solstice \u00e0 l\u2019autre<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/27\/un-soleil-omega-se-leve-sur-la-mer-mediterranee\/\" target=\"_blank\" rel=\"noopener\">Un \u201cSoleil Om\u00e9ga\u201d se l\u00e8ve sur la M\u00e9diterran\u00e9e<\/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>L&#8217;activit\u00e9 solaire s&#8217;intensifie, la preuve avec un grand groupe de taches que l&#8217;on peut suivre \u00e0 l&#8217;\u0153il nu en prenant certaines pr\u00e9cautions. Un groupe qui prend de l&#8217;ampleur : Apparu le 17 avril, le groupe de taches solaires AR 2993-94 s&#8217;\u00e9tend de plus en plus. Il compte d\u00e9sormais quatre ensembles num\u00e9rot\u00e9s de 2993 \u00e0 2996, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/04\/23\/un-grand-groupe-de-taches-solaires-devient-visible-a-loeil-nu\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un grand groupe de taches solaires devient visible \u00e0 l&#8217;\u0153il nu<\/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":15836,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[97,3107],"class_list":["post-15835","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-soleil","tag-taches-solaires"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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