{"id":61752,"date":"2026-08-02T10:39:02","date_gmt":"2026-08-02T08:39:02","guid":{"rendered":"https:\/\/alertes-meteo.com\/?page_id=61752"},"modified":"2026-08-02T13:51:58","modified_gmt":"2026-08-02T11:51:58","slug":"le-feu-de-saint-elme-la-lueur-bleue-qui-annonce-lorage","status":"publish","type":"page","link":"https:\/\/alertes-meteo.com\/index.php\/les-orages-en-france-comprendre-et-anticiper\/le-feu-de-saint-elme-la-lueur-bleue-qui-annonce-lorage\/","title":{"rendered":"Le feu de Saint-Elme : lueur bleue qui annonce l&rsquo;orage"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1575px;margin-left: calc(-5% \/ 2 );margin-right: calc(-5% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-blend:overlay;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:2.375%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.375%;--awb-width-medium:100%;--awb-spacing-right-medium:2.375%;--awb-spacing-left-medium:2.375%;--awb-width-small:100%;--awb-spacing-right-small:2.375%;--awb-spacing-left-small:2.375%;\"><div class=\"fusion-column-wrapper fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>Un m\u00e2t de navire qui s&rsquo;illumine d&rsquo;une lueur bleut\u00e9e en pleine temp\u00eate. Des cornes de b\u00e9tail qui cr\u00e9pitent sous un ciel d&rsquo;orage. Le nez d&rsquo;un avion couronn\u00e9 de filaments violets \u00e0 10 000 m\u00e8tres d&rsquo;altitude.<\/p>\n<p>Le <strong>feu de Saint-Elme<\/strong> fascine les marins depuis l&rsquo;Antiquit\u00e9 et intrigue encore aujourd&rsquo;hui les pilotes de ligne. Longtemps interpr\u00e9t\u00e9 comme un pr\u00e9sage \u2014 favorable ou funeste selon les \u00e9poques \u2014 il r\u00e9pond en r\u00e9alit\u00e9 \u00e0 un m\u00e9canisme \u00e9lectrique parfaitement identifi\u00e9 : la <strong>d\u00e9charge corona<\/strong>.<\/p>\n<p>Ce ph\u00e9nom\u00e8ne n&rsquo;est pas un \u00e9clair, ne provoque pas de br\u00fblure et ne met g\u00e9n\u00e9ralement pas la vie en danger. Il constitue en revanche un <strong>signal d&rsquo;alerte pr\u00e9cieux<\/strong> : sa pr\u00e9sence indique un champ \u00e9lectrique atmosph\u00e9rique intense, donc un risque de foudroiement imminent dans les environs.<\/p>\n<hr \/>\n<h2>Qu&rsquo;est-ce que le feu de Saint-Elme ?<\/h2>\n<p>Le feu de Saint-Elme est une <strong>d\u00e9charge \u00e9lectrique lumineuse continue<\/strong>, de faible intensit\u00e9, qui se forme \u00e0 l&rsquo;extr\u00e9mit\u00e9 d&rsquo;objets pointus et conducteurs lorsque le champ \u00e9lectrique atmosph\u00e9rique atteint des valeurs extr\u00eames.<\/p>\n<\/div><!-- Tableau WordPress : reconna\u00eetre le feu de Saint-Elme -->\n<section class=\"fse-wrap\" aria-labelledby=\"fse-title\">\n  <style>\n    .fse-wrap,\n    .fse-wrap * {\n      box-sizing: border-box;\n    }\n\n    .fse-wrap {\n      --fse-navy: #111a3a;\n      --fse-blue: #1f7ae0;\n      --fse-violet: #7757df;\n      --fse-pale: #edf6ff;\n      --fse-border: #d8e4f3;\n      --fse-text: 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   }\n\n      .fse-note {\n        margin: 12px;\n        padding: 14px;\n        font-size: 0.89rem;\n      }\n    }\n\n    @media (prefers-reduced-motion: reduce) {\n      .fse-table tbody tr {\n        transition: none;\n      }\n    }\n  <\/style>\n\n  <div class=\"fse-card\">\n    <header class=\"fse-head\">\n      <div class=\"fse-kicker\">\u26a1 D\u00e9charge \u00e9lectrique atmosph\u00e9rique<\/div>\n      <h2 id=\"fse-title\">Reconna\u00eetre le feu de Saint-Elme<\/h2>\n      <p>Une lueur \u00e9lectrique parfois observ\u00e9e sur les objets pointus lorsque le champ \u00e9lectrique atmosph\u00e9rique devient tr\u00e8s intense.<\/p>\n    <\/header>\n\n    <div class=\"fse-table-scroll\">\n      <table class=\"fse-table\">\n        <thead>\n          <tr>\n            <th scope=\"col\">Crit\u00e8re<\/th>\n            <th scope=\"col\">Description<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u25cf<\/span>Couleur<\/th>\n            <td><span class=\"fse-glow\">Bleue, violette<\/span>, parfois blanch\u00e2tre<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u2726<\/span>Forme<\/th>\n            <td>Filaments, aigrettes, plumeaux ou couronne lumineuse<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u25f7<\/span>Dur\u00e9e<\/th>\n            <td>Lueur continue, de quelques secondes \u00e0 plusieurs minutes<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u266b<\/span>Bruit<\/th>\n            <td>Gr\u00e9sillement, cr\u00e9pitement ou sifflement parfois audible<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u2248<\/span>Odeur<\/th>\n            <td>Odeur caract\u00e9ristique d\u2019<strong>ozone<\/strong>, parfois perceptible<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u2744<\/span>Chaleur<\/th>\n            <td>Aucune chaleur perceptible : il s\u2019agit d\u2019un ph\u00e9nom\u00e8ne lumineux dit \u00ab froid \u00bb<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\"><span class=\"fse-icon\" aria-hidden=\"true\">\u2316<\/span>Localisation<\/th>\n            <td>Pointes m\u00e9talliques, m\u00e2ts, antennes, paratonnerres et autres objets saillants<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <aside class=\"fse-note\" aria-label=\"Information de s\u00e9curit\u00e9\">\n      <span class=\"fse-alert\" aria-hidden=\"true\">\u26a0\ufe0f<\/span>\n      <div><strong>\u00c0 retenir :<\/strong> le feu de Saint-Elme est une d\u00e9charge corona, et non une flamme. Sa pr\u00e9sence r\u00e9v\u00e8le un champ \u00e9lectrique intense et peut accompagner un orage proche. \u00c9loignez-vous des points hauts et objets m\u00e9talliques expos\u00e9s, puis mettez-vous \u00e0 l\u2019abri.<\/div>\n    <\/aside>\n  <\/div>\n<\/section><div class=\"fusion-text fusion-text-2\"><p>Contrairement \u00e0 l&rsquo;\u00e9clair, qui est une d\u00e9charge <strong>brutale et transitoire<\/strong>, le feu de Saint-Elme est un \u00e9coulement <strong>lent et permanent<\/strong> de charges \u00e9lectriques.<\/p>\n<hr \/>\n<h2>L&rsquo;explication scientifique : la d\u00e9charge corona<\/h2>\n<h3>Le m\u00e9canisme<\/h3>\n<p>Par temps calme, le champ \u00e9lectrique atmosph\u00e9rique avoisine <strong>100 volts par m\u00e8tre<\/strong>. Sous un cumulonimbus mature, il peut grimper \u00e0 <strong>10 000 volts par m\u00e8tre<\/strong>, voire davantage.<\/p>\n<p>Ce champ se concentre naturellement aux <strong>extr\u00e9mit\u00e9s pointues<\/strong> : c&rsquo;est l&rsquo;<strong>effet de pointe<\/strong>. Autour d&rsquo;une antenne ou d&rsquo;un m\u00e2t, l&rsquo;intensit\u00e9 locale peut \u00eatre multipli\u00e9e par plusieurs dizaines.<\/p>\n<p>Lorsque le seuil critique est franchi \u2014 environ <strong>30 000 volts par centim\u00e8tre<\/strong> dans l&rsquo;air sec au niveau de la mer \u2014 l&rsquo;air cesse d&rsquo;\u00eatre isolant :<\/p>\n<ol>\n<li>Les mol\u00e9cules d&rsquo;air se <strong>ionisent<\/strong> autour de la pointe<\/li>\n<li>Les \u00e9lectrons lib\u00e9r\u00e9s acc\u00e9l\u00e8rent et <strong>percutent<\/strong> d&rsquo;autres mol\u00e9cules<\/li>\n<li>Un <strong>plasma froid<\/strong> se forme, localis\u00e9<\/li>\n<li>Les mol\u00e9cules excit\u00e9es <strong>restituent l&rsquo;\u00e9nergie sous forme de lumi\u00e8re<\/strong><\/li>\n<\/ol>\n<h3>Pourquoi cette couleur bleue ?<\/h3>\n<p>La teinte bleu-violet provient de la composition de l&rsquo;atmosph\u00e8re. L&rsquo;<strong>azote<\/strong>, qui repr\u00e9sente 78 % de l&rsquo;air, \u00e9met principalement dans le bleu et l&rsquo;ultraviolet lorsqu&rsquo;il est excit\u00e9 puis d\u00e9sexcit\u00e9.<\/p>\n<p>C&rsquo;est le m\u00eame principe qui donne leur couleur aux tubes n\u00e9on et aux jets bleus observ\u00e9s au-dessus des orages.<\/p>\n<hr \/>\n<h2>O\u00f9 et quand l&rsquo;observer ?<\/h2>\n<h3>Les conditions favorables<\/h3>\n<p>Le feu de Saint-Elme exige une <strong>conjonction de facteurs<\/strong> :<\/p>\n<ul>\n<li>Un <strong>champ \u00e9lectrique intense<\/strong> : orage proche, cumulonimbus mature, blizzard charg\u00e9<\/li>\n<li>Un <strong>objet pointu et conducteur<\/strong> : m\u00e2t, antenne, paratonnerre, aile d&rsquo;avion<\/li>\n<li>Une <strong>obscurit\u00e9 suffisante<\/strong> : le ph\u00e9nom\u00e8ne est peu lumineux<\/li>\n<li>Une <strong>atmosph\u00e8re humide ou charg\u00e9e en particules<\/strong>, qui abaisse le seuil d&rsquo;ionisation<\/li>\n<\/ul>\n<h3>Les lieux d&rsquo;observation classiques<\/h3>\n<p><strong>En mer.<\/strong> C&rsquo;est le contexte historique. Les m\u00e2ts de navire, isol\u00e9s au-dessus de l&rsquo;eau, concentrent le champ \u00e9lectrique. Les marins de l&rsquo;Antiquit\u00e9 y voyaient l&rsquo;intervention de <strong>saint \u00c9rasme de Formia<\/strong> \u2014 saint Elme \u2014 patron des navigateurs.<\/p>\n<p><strong>En montagne.<\/strong> Les sommets, croix, c\u00e2bles de remont\u00e9es m\u00e9caniques et piolets peuvent s&rsquo;illuminer. Les randonneurs rapportent aussi des <strong>cheveux qui se dressent<\/strong> et des <strong>bourdonnements<\/strong> : signes d&rsquo;un danger imm\u00e9diat.<\/p>\n<p><strong>En aviation.<\/strong> Le ph\u00e9nom\u00e8ne est courant sur les pare-brise, nez et bords d&rsquo;attaque des avions traversant des zones charg\u00e9es. Les pilotes le connaissent bien et le signalent r\u00e9guli\u00e8rement.<\/p>\n<p><strong>Au sol.<\/strong> Antennes, clochers, \u00e9oliennes, paratonnerres et lignes haute tension peuvent produire des aigrettes visibles de nuit.<\/p>\n<\/div><!-- Tableau WordPress : feu de Saint-Elme, \u00e9clair et foudre en boule -->\n<section class=\"sef-wrap\" aria-labelledby=\"sef-title\">\n  <style>\n    .sef-wrap,\n    .sef-wrap * { box-sizing: border-box; }\n\n    .sef-wrap {\n      --sef-navy: #111a3a;\n      --sef-border: #d9e4f2;\n      --sef-text: #17213a;\n      width: 100%;\n      max-width: 1120px;\n      margin: 24px auto;\n      color: var(--sef-text);\n      font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Arial, sans-serif;\n    }\n\n    .sef-card {\n      overflow: hidden;\n      border: 1px solid var(--sef-border);\n      border-radius: 20px;\n      background: #fff;\n      box-shadow: 0 14px 36px rgba(22, 42, 86, 0.12);\n    }\n\n    .sef-head {\n      position: relative;\n      overflow: hidden;\n      padding: 28px 24px 26px;\n      color: #fff;\n      text-align: center;\n      background:\n        radial-gradient(circle at 18% 12%, rgba(83, 189, 255, 0.45), transparent 28%),\n        radial-gradient(circle at 84% 18%, rgba(183, 111, 255, 0.4), transparent 30%),\n        linear-gradient(135deg, #101a3b 0%, #173f82 48%, #643795 100%);\n    }\n\n    .sef-head::after {\n      content: \"\";\n      position: absolute;\n      right: 11%;\n      bottom: -44px;\n      width: 135px;\n      height: 135px;\n      border: 1px solid rgba(197, 226, 255, 0.25);\n      border-radius: 50%;\n      box-shadow: 0 0 36px rgba(108, 191, 255, 0.28);\n    }\n\n    .sef-kicker {\n      display: inline-flex;\n      align-items: center;\n      gap: 8px;\n      margin-bottom: 10px;\n      padding: 6px 12px;\n      border: 1px solid rgba(255,255,255,0.38);\n      border-radius: 999px;\n      background: rgba(255,255,255,0.12);\n      font-size: .76rem;\n      font-weight: 800;\n      letter-spacing: .08em;\n      text-transform: uppercase;\n    }\n\n    .sef-head h2 {\n      position: relative;\n      z-index: 1;\n      margin: 0;\n      color: #fff;\n      font-size: clamp(1.5rem, 4vw, 2.2rem);\n      line-height: 1.15;\n    }\n\n    .sef-head p {\n      position: relative;\n      z-index: 1;\n      max-width: 780px;\n      margin: 10px auto 0;\n      color: rgba(255,255,255,0.9);\n      font-size: 1rem;\n      line-height: 1.55;\n    }\n\n    .sef-table-scroll { overflow-x: auto; 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padding: 14px; font-size: .89rem; }\n    }\n\n    @media (prefers-reduced-motion: reduce) {\n      .sef-table tbody tr { transition: none; }\n    }\n  <\/style>\n\n  <div class=\"sef-card\">\n    <header class=\"sef-head\">\n      <div class=\"sef-kicker\">\u26a1 Ph\u00e9nom\u00e8nes \u00e9lectriques atmosph\u00e9riques<\/div>\n      <h2 id=\"sef-title\">Feu de Saint-Elme, \u00e9clair ou foudre en boule ?<\/h2>\n      <p>Trois manifestations lumineuses tr\u00e8s diff\u00e9rentes par leur m\u00e9canisme, leur dur\u00e9e, leur mobilit\u00e9 et leur niveau de danger.<\/p>\n    <\/header>\n\n    <div class=\"sef-table-scroll\">\n      <table class=\"sef-table\">\n        <thead>\n          <tr>\n            <th scope=\"col\">Ph\u00e9nom\u00e8ne<\/th>\n            <th scope=\"col\">Feu de Saint-Elme<\/th>\n            <th scope=\"col\">\u00c9clair<\/th>\n            <th scope=\"col\">Foudre en boule<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <th scope=\"row\">Nature<\/th>\n            <td data-label=\"Feu de Saint-Elme\">D\u00e9charge corona quasi continue autour d\u2019un objet soumis \u00e0 un champ \u00e9lectrique intense<\/td>\n            <td data-label=\"\u00c9clair\">D\u00e9charge \u00e9lectrique disruptive et tr\u00e8s br\u00e8ve<\/td>\n            <td data-label=\"Foudre en boule\">Ph\u00e9nom\u00e8ne lumineux rare, encore imparfaitement expliqu\u00e9<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Dur\u00e9e<\/th>\n            <td data-label=\"Feu de Saint-Elme\">Quelques secondes \u00e0 plusieurs minutes<\/td>\n            <td data-label=\"\u00c9clair\">Quelques millisecondes \u00e0 moins d\u2019une seconde<\/td>\n            <td data-label=\"Foudre en boule\">G\u00e9n\u00e9ralement quelques secondes<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Mobilit\u00e9<\/th>\n            <td data-label=\"Feu de Saint-Elme\">Fixe, attach\u00e9 \u00e0 une pointe ou \u00e0 un objet<\/td>\n            <td data-label=\"\u00c9clair\">Canal bref, parfois parcouru par plusieurs impulsions<\/td>\n            <td data-label=\"Foudre en boule\">Peut se d\u00e9placer librement selon les t\u00e9moignages<\/td>\n          <\/tr>\n          <tr>\n            <th scope=\"row\">Danger direct<\/th>\n            <td data-label=\"Feu de Saint-Elme\"><span class=\"sef-risk-low\">Faible en lui-m\u00eame<\/span><\/td>\n            <td data-label=\"\u00c9clair\"><span class=\"sef-risk-high\">Tr\u00e8s \u00e9lev\u00e9<\/span><\/td>\n            <td data-label=\"Foudre en boule\"><span class=\"sef-risk-variable\">Variable et mal quantifi\u00e9<\/span><\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <aside class=\"sef-note\" aria-label=\"Information de s\u00e9curit\u00e9\">\n      <span class=\"sef-alert\" aria-hidden=\"true\">\u26a0\ufe0f<\/span>\n      <div><strong>\u00c0 retenir :<\/strong> le feu de Saint-Elme est g\u00e9n\u00e9ralement peu dangereux en lui-m\u00eame, mais sa pr\u00e9sence r\u00e9v\u00e8le un champ \u00e9lectrique atmosph\u00e9rique intense. Elle doit \u00eatre consid\u00e9r\u00e9e comme un signal d\u2019alerte : mettez-vous \u00e0 l\u2019abri et \u00e9loignez-vous des points hauts, des m\u00e2ts et des objets m\u00e9talliques expos\u00e9s.<\/div>\n    <\/aside>\n  <\/div>\n<\/section>\n<div class=\"fusion-text fusion-text-3\"><h2>Est-ce dangereux ?<\/h2>\n<h3>Le ph\u00e9nom\u00e8ne en lui-m\u00eame<\/h3>\n<p>Non. La d\u00e9charge corona transporte des courants de l&rsquo;ordre du <strong>microamp\u00e8re au milliamp\u00e8re<\/strong>. Elle ne br\u00fble pas, ne chauffe pas et ne provoque pas d&rsquo;\u00e9lectrocution.<\/p>\n<p>Les marins pouvaient observer les aigrettes au sommet de leur m\u00e2t sans cons\u00e9quence, et les avions traversent ces zones quotidiennement.<\/p>\n<h3>Ce qu&rsquo;il annonce, en revanche<\/h3>\n<p><strong>C&rsquo;est l\u00e0 que r\u00e9side le vrai risque.<\/strong><\/p>\n<p>La pr\u00e9sence d&rsquo;un feu de Saint-Elme signifie que le champ \u00e9lectrique local a atteint des valeurs extr\u00eames. Autrement dit : <strong>les conditions d&rsquo;un coup de foudre sont r\u00e9unies<\/strong>.<\/p>\n<p>En montagne ou en terrain d\u00e9couvert, ce ph\u00e9nom\u00e8ne \u2014 comme les cheveux dress\u00e9s ou le bourdonnement des rochers \u2014 constitue un <strong>avertissement de derni\u00e8re minute<\/strong>. La r\u00e9action doit \u00eatre imm\u00e9diate :<\/p>\n<ol>\n<li><strong>Descendre<\/strong> ou quitter les zones expos\u00e9es sans d\u00e9lai<\/li>\n<li><strong>S&rsquo;\u00e9loigner<\/strong> des objets m\u00e9talliques et des points hauts<\/li>\n<li><strong>Se mettre \u00e0 l&rsquo;abri<\/strong> dans un b\u00e2timent ou un v\u00e9hicule ferm\u00e9<\/li>\n<li>\u00c0 d\u00e9faut, adopter la <strong>position de s\u00e9curit\u00e9<\/strong> : accroupi, pieds joints, sur un isolant<\/li>\n<\/ol>\n<h3>En aviation<\/h3>\n<p>Les effets restent mineurs : perturbations radio temporaires, parasites sur les instruments, d\u00e9charges sur le fuselage. Les avions sont con\u00e7us pour \u00e9vacuer ces charges via les <strong>dispositifs de d\u00e9charge statique<\/strong> plac\u00e9s en bout d&rsquo;ailes.<\/p>\n<hr \/>\n<h2>Un ph\u00e9nom\u00e8ne charg\u00e9 d&rsquo;histoire<\/h2>\n<p>Les r\u00e9cits remontent \u00e0 l&rsquo;Antiquit\u00e9. <strong>Pline l&rsquo;Ancien<\/strong> \u00e9voque d\u00e9j\u00e0 ces lueurs sur les m\u00e2ts, associ\u00e9es aux dieux Castor et Pollux : deux flammes annon\u00e7aient la fin de la temp\u00eate, une seule pr\u00e9sageait le malheur.<\/p>\n<p><strong>Christophe Colomb<\/strong>, <strong>Magellan<\/strong> et <strong>Darwin<\/strong> ont tous consign\u00e9 des observations. Shakespeare l&rsquo;\u00e9voque dans <em>La Temp\u00eate<\/em>. Melville le d\u00e9crit dans <em>Moby Dick<\/em>.<\/p>\n<p>Il faudra attendre les travaux sur l&rsquo;\u00e9lectricit\u00e9 atmosph\u00e9rique \u2014 <strong>Benjamin Franklin<\/strong> au XVIII&lt;sup&gt;e&lt;\/sup&gt; si\u00e8cle, puis la physique des plasmas au XX&lt;sup&gt;e&lt;\/sup&gt; \u2014 pour en \u00e9tablir l&rsquo;explication rigoureuse.<\/p>\n<hr \/>\n<h2>FAQ<\/h2>\n<p><strong>Le feu de Saint-Elme est-il de la foudre ?<\/strong> Non. C&rsquo;est une d\u00e9charge corona continue et de faible intensit\u00e9, alors que la foudre est une d\u00e9charge disruptive brutale.<\/p>\n<p><strong>Peut-on le toucher sans risque ?<\/strong> Le ph\u00e9nom\u00e8ne lui-m\u00eame n&rsquo;est pas dangereux, mais toucher un objet en cours de d\u00e9charge dans un champ \u00e9lectrique aussi intense est fortement d\u00e9conseill\u00e9 : la foudre peut tomber \u00e0 tout instant.<\/p>\n<p><strong>Peut-on le voir en plein jour ?<\/strong> Tr\u00e8s difficilement. Sa luminosit\u00e9 est faible ; il est presque exclusivement observ\u00e9 de nuit ou dans une forte obscurit\u00e9.<\/p>\n<p><strong>Annonce-t-il forc\u00e9ment la foudre ?<\/strong> Il indique un champ \u00e9lectrique critique. Le risque de foudroiement \u00e0 proximit\u00e9 est \u00e9lev\u00e9, sans \u00eatre syst\u00e9matique.<\/p>\n<p><strong>Pourquoi ce nom ?<\/strong> En r\u00e9f\u00e9rence \u00e0 saint \u00c9rasme de Formia, dit saint Elme, patron des marins m\u00e9diterran\u00e9ens, dont les navigateurs voyaient la protection dans ces lueurs.<\/p>\n<p><strong>Se produit-il en dehors des orages ?<\/strong> Oui. Les temp\u00eates de neige, les temp\u00eates de sable et les \u00e9ruptions volcaniques g\u00e9n\u00e8rent des champs \u00e9lectriques suffisants.<\/p>\n<p><strong>Est-ce fr\u00e9quent en France ?<\/strong> Il est rarement observ\u00e9, faute d&rsquo;obscurit\u00e9 et de conditions r\u00e9unies simultan\u00e9ment, mais il se produit r\u00e9guli\u00e8rement sur les antennes, les sommets et les a\u00e9ronefs.<\/p>\n<hr \/>\n<h2>Conclusion<\/h2>\n<p>Le feu de Saint-Elme n&rsquo;a rien de surnaturel : c&rsquo;est une d\u00e9charge corona, produit direct d&rsquo;un champ \u00e9lectrique atmosph\u00e9rique pouss\u00e9 \u00e0 l&rsquo;extr\u00eame. Sa lueur bleut\u00e9e, silencieuse ou cr\u00e9pitante, ne br\u00fble pas et ne foudroie pas.<\/p>\n<p>Mais elle parle. Elle signale que l&rsquo;atmosph\u00e8re est \u00e9lectriquement satur\u00e9e et qu&rsquo;un coup de foudre peut survenir dans les secondes qui suivent. En montagne comme en mer, ce signal impose une seule r\u00e9ponse : <strong>se mettre \u00e0 l&rsquo;abri imm\u00e9diatement<\/strong>.<\/p>\n<p><strong>Suivez l&rsquo;activit\u00e9 \u00e9lectrique en temps r\u00e9el sur notre <a href=\"https:\/\/alertes-meteo.com\/index.php\/cartes-meteo\/carte-de-la-foudre-en-direct-en-france-suivez-chaque-impact-en-temps-reel\/\" target=\"_blank\" rel=\"noopener noreferrer\">carte de la foudre en direct<\/a> et notre <a href=\"https:\/\/alertes-meteo.com\/index.php\/cartes-meteo\/radar-meteo\/\" target=\"_blank\" rel=\"noopener noreferrer\">radar m\u00e9t\u00e9o<\/a>, et approfondissez avec notre dossier <a href=\"https:\/\/alertes-meteo.com\/index.php\/les-orages-en-france-comprendre-et-anticiper\/\" target=\"_blank\" rel=\"noopener noreferrer\">Les orages en France : comprendre et anticiper<\/a>.<\/strong><\/p>\n<\/div><!--\n  BANNI\u00c8RE \u00ab MENU ORAGES \u00bb POUR WORDPRESS\n  \u00c0 coller dans un bloc \u00ab HTML personnalis\u00e9 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{\n      max-width: 100%;\n    }\n  }\n\n  @media (prefers-reduced-motion: reduce) {\n    .amo-orage-banner__link,\n    .amo-orage-banner__cta-arrow {\n      transition: none;\n    }\n  }\n<\/style>\n\n<div class=\"amo-orage-banner\">\n  <a\n    class=\"amo-orage-banner__link\"\n    href=\"https:\/\/alertes-meteo.com\/index.php\/les-orages-en-france-comprendre-et-anticiper\/\"\n    aria-label=\"Acc\u00e9der au menu consacr\u00e9 aux orages\"\n  >\n    <div class=\"amo-orage-banner__content\">\n      <p class=\"amo-orage-banner__kicker\">Comprendre \u2022 Pr\u00e9voir \u2022 Se prot\u00e9ger<\/p>\n      <p class=\"amo-orage-banner__title\">Menu Orages<\/p>\n      <p class=\"amo-orage-banner__description\">\n        Comprendre les ph\u00e9nom\u00e8nes orageux, reconna\u00eetre les principaux dangers\n        et d\u00e9couvrir les conseils essentiels pour mieux les anticiper.\n      <\/p>\n      <span class=\"amo-orage-banner__cta\">\n        D\u00e9couvrir le dossier orages\n        <span class=\"amo-orage-banner__cta-arrow\" aria-hidden=\"true\">\u2192<\/span>\n      <\/span>\n    <\/div>\n\n    <span class=\"amo-orage-banner__visual\" aria-hidden=\"true\">\n      <span class=\"amo-orage-banner__bolt\"><\/span>\n    <\/span>\n  <\/a>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":61756,"parent":61283,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_titles_title":"Feu de Saint-Elme : origine, explication et observation | Alertes-M\u00e9t\u00e9o","_seopress_titles_desc":"Le feu de Saint-Elme, cette lueur bleut\u00e9e qui appara\u00eet sur les m\u00e2ts et les avions : explication scientifique, conditions d'apparition et dangers 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