{"id":61734,"date":"2026-08-02T10:26:44","date_gmt":"2026-08-02T08:26:44","guid":{"rendered":"https:\/\/alertes-meteo.com\/?page_id=61734"},"modified":"2026-08-02T13:49:19","modified_gmt":"2026-08-02T11:49:19","slug":"elfes-et-jets-bleus-les-phenomenes-lumineux-au-dessus-des-orages","status":"publish","type":"page","link":"https:\/\/alertes-meteo.com\/index.php\/les-orages-en-france-comprendre-et-anticiper\/elfes-et-jets-bleus-les-phenomenes-lumineux-au-dessus-des-orages\/","title":{"rendered":"Elfes et jets bleus : ph\u00e9nom\u00e8nes lumineux"},"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>Au-dessus des orages les plus puissants, \u00e0 des altitudes o\u00f9 aucun nuage ne peut se former, l&rsquo;atmosph\u00e8re s&rsquo;illumine parfois de lueurs fugaces, color\u00e9es, invisibles \u00e0 l&rsquo;\u0153il nu depuis le sol.<\/p>\n<p>Ces ph\u00e9nom\u00e8nes portent des noms qui semblent emprunt\u00e9s \u00e0 la mythologie : <strong>elfes<\/strong>, <strong>jets bleus<\/strong>, <strong>sprites<\/strong>, <strong>halos<\/strong>. Ils sont pourtant bien r\u00e9els, document\u00e9s scientifiquement depuis 1989, et constituent aujourd&rsquo;hui l&rsquo;un des champs les plus actifs de la recherche atmosph\u00e9rique.<\/p>\n<p>Regroup\u00e9s sous le terme de <strong>TLE<\/strong> (<em>Transient Luminous Events<\/em>, ou ph\u00e9nom\u00e8nes lumineux transitoires), ils se d\u00e9clenchent au-dessus des syst\u00e8mes orageux les plus \u00e9lectriquement actifs \u2014 ceux-l\u00e0 m\u00eames que nous suivons en temps r\u00e9el sur nos cartes de foudre.<\/p>\n<hr \/>\n<h2>O\u00f9 se produisent-ils ?<\/h2>\n<p>La distinction est essentielle : <strong>les TLE ne sont pas des \u00e9clairs ordinaires<\/strong>. Ils ne se produisent ni dans le nuage, ni entre le nuage et le sol, mais <strong>au-dessus du cumulonimbus<\/strong>, dans des couches atmosph\u00e9riques extr\u00eamement rar\u00e9fi\u00e9es.<\/p>\n<\/div><!-- COUCHES ATMOSPHERIQUES ET PHENOMENES ORAGEUX \u2014 WORDPRESS -->\n<style>\n  .mcp-atmo,\n  .mcp-atmo * {\n    box-sizing: border-box;\n  }\n\n  .mcp-atmo {\n    --ink: #172033;\n    --line: #dbe4ef;\n    max-width: 920px;\n    margin: 26px auto;\n    color: var(--ink);\n    font-family: Arial, Helvetica, sans-serif;\n  }\n\n  .mcp-atmo__title {\n    margin: 0;\n    padding: 22px 18px 20px;\n    color: #fff;\n    font-size: clamp(22px, 3vw, 30px);\n    font-weight: 900;\n    line-height: 1.15;\n    text-align: center;\n    background: linear-gradient(135deg, #082f49 0%, #1d4ed8 42%, #6d28d9 72%, #be185d 100%);\n    border-radius: 18px 18px 0 0;\n  }\n\n  .mcp-atmo__subtitle {\n    display: block;\n    margin-top: 8px;\n    color: #e0e7ff;\n    font-size: 14px;\n    font-weight: 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100%;\n    }\n\n    .mcp-atmo thead {\n      display: none;\n    }\n\n    .mcp-atmo tbody tr {\n      overflow: hidden;\n      margin-bottom: 14px;\n      background: #fff;\n      border: 1px solid #d8e1ec;\n      border-radius: 13px;\n      box-shadow: 0 5px 15px rgba(15, 23, 42, .08);\n    }\n\n    .mcp-atmo tbody tr:last-child {\n      margin-bottom: 0;\n    }\n\n    .mcp-atmo tbody th {\n      padding: 15px;\n      font-size: 17px;\n      text-align: center;\n      border: 0;\n    }\n\n    .mcp-atmo tbody td {\n      position: relative;\n      padding: 12px 12px 12px 43%;\n      font-size: 14px;\n      text-align: left;\n      white-space: normal;\n      border-right: 0;\n      border-bottom: 1px solid #e7edf4;\n    }\n\n    .mcp-atmo tbody td::before {\n      position: absolute;\n      top: 12px;\n      left: 12px;\n      width: 35%;\n      color: #475569;\n      font-size: 11px;\n      font-weight: 900;\n      line-height: 1.25;\n      text-transform: uppercase;\n    }\n\n    .mcp-atmo tbody td:nth-child(2)::before {\n      content: \"Altitude\";\n      color: #1d4ed8;\n    }\n\n    .mcp-atmo tbody td:nth-child(3)::before {\n      content: \"Ph\u00e9nom\u00e8ne associ\u00e9\";\n      color: #6d28d9;\n    }\n\n    .mcp-atmo tbody td:last-child {\n      border-bottom: 0;\n    }\n  }\n\n  @media (max-width: 430px) {\n    .mcp-atmo tbody td {\n      padding-left: 12px;\n    }\n\n    .mcp-atmo tbody td::before {\n      position: static;\n      display: block;\n      width: auto;\n      margin-bottom: 4px;\n    }\n  }\n<\/style>\n\n<section class=\"mcp-atmo\" aria-labelledby=\"mcp-atmo-title\">\n  <h2 class=\"mcp-atmo__title\" id=\"mcp-atmo-title\">\n    De l\u2019orage aux portes de l\u2019espace\n    <span class=\"mcp-atmo__subtitle\">Les ph\u00e9nom\u00e8nes \u00e9lectriques selon les couches de l\u2019atmosph\u00e8re<\/span>\n  <\/h2>\n\n  <div class=\"mcp-atmo__scroll\" role=\"region\" aria-label=\"Tableau des couches atmosph\u00e9riques et des ph\u00e9nom\u00e8nes \u00e9lectriques associ\u00e9s\" tabindex=\"0\">\n    <table>\n      <thead>\n        <tr>\n          <th scope=\"col\">Couche<\/th>\n          <th scope=\"col\">Altitude<\/th>\n          <th scope=\"col\">Ph\u00e9nom\u00e8ne associ\u00e9<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr data-layer=\"tropo\">\n          <th scope=\"row\">Troposph\u00e8re (orage)<\/th>\n          <td>0 \u00e0 15 km<\/td>\n          <td>\u00c9clairs classiques et foudre<\/td>\n        <\/tr>\n        <tr data-layer=\"strato\">\n          <th scope=\"row\">Stratosph\u00e8re<\/th>\n          <td>15 \u00e0 50 km<\/td>\n          <td>Jets bleus et d\u00e9part des jets g\u00e9ants<\/td>\n        <\/tr>\n        <tr data-layer=\"meso\">\n          <th scope=\"row\">M\u00e9sosph\u00e8re<\/th>\n          <td>50 \u00e0 85 km<\/td>\n          <td>Farfadets (sprites), halos et prolongement des jets g\u00e9ants<\/td>\n        <\/tr>\n        <tr data-layer=\"iono\">\n          <th scope=\"row\">Basse ionosph\u00e8re<\/th>\n          <td>85 \u00e0 100 km<\/td>\n          <td><strong>Elfes (ELVES)<\/strong><\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p class=\"mcp-atmo__note\">\n    <strong>\u00c0 retenir :<\/strong> les limites entre les couches atmosph\u00e9riques sont approximatives et varient notamment avec la latitude et la saison. Certains ph\u00e9nom\u00e8nes lumineux transitoires traversent plusieurs \u00e9tages : les farfadets peuvent s\u2019\u00e9tendre sur une grande partie de la m\u00e9sosph\u00e8re, tandis que les jets g\u00e9ants relient parfois le sommet de l\u2019orage aux r\u00e9gions ionis\u00e9es de la haute atmosph\u00e8re.\n  <\/p>\n<\/section><div class=\"fusion-text fusion-text-2\"><p>\u00c0 ces altitudes, la pression atmosph\u00e9rique est si faible que l&rsquo;air se comporte comme un gaz rar\u00e9fi\u00e9 : il devient conducteur et s&rsquo;illumine sous l&rsquo;effet d&rsquo;un champ \u00e9lectrique, \u00e0 la mani\u00e8re d&rsquo;un tube n\u00e9on.<\/p>\n<hr \/>\n<h2>Les elfes : des anneaux lumineux fugaces<\/h2>\n<h3>Qu&rsquo;est-ce qu&rsquo;un elfe ?<\/h3>\n<p>Un <strong>elfe<\/strong> (acronyme anglais <em>ELVES<\/em> : <em>Emissions of Light and Very Low Frequency perturbations due to Electromagnetic Pulse Sources<\/em>) est un <strong>anneau lumineux rouge\u00e2tre<\/strong> qui se dilate horizontalement dans la basse ionosph\u00e8re, vers 90 km d&rsquo;altitude.<\/p>\n<h3>Caract\u00e9ristiques<\/h3>\n<ul>\n<li><strong>Dur\u00e9e :<\/strong> moins d&rsquo;<strong>1 milliseconde<\/strong> \u2014 le ph\u00e9nom\u00e8ne lumineux le plus bref de l&rsquo;atmosph\u00e8re<\/li>\n<li><strong>Diam\u00e8tre :<\/strong> jusqu&rsquo;\u00e0 <strong>300 \u00e0 500 km<\/strong><\/li>\n<li><strong>Couleur :<\/strong> rouge, par excitation de l&rsquo;azote atmosph\u00e9rique<\/li>\n<li><strong>Forme :<\/strong> disque ou anneau s&rsquo;\u00e9largissant \u00e0 vitesse quasi lumineuse<\/li>\n<\/ul>\n<h3>M\u00e9canisme<\/h3>\n<p>Un elfe na\u00eet de l&rsquo;<strong>impulsion \u00e9lectromagn\u00e9tique<\/strong> g\u00e9n\u00e9r\u00e9e par un \u00e9clair particuli\u00e8rement intense \u2014 le plus souvent un \u00e9clair <strong>positif<\/strong> nuage-sol de forte intensit\u00e9.<\/p>\n<p>Cette impulsion se propage vers le haut \u00e0 la vitesse de la lumi\u00e8re. En atteignant la basse ionosph\u00e8re, elle excite les mol\u00e9cules d&rsquo;azote, qui \u00e9mettent bri\u00e8vement dans le rouge. L&rsquo;anneau s&rsquo;\u00e9largit parce que le front d&rsquo;onde touche la couche ionosph\u00e9rique en cercles concentriques croissants.<\/p>\n<p>Sa bri\u00e8vet\u00e9 extr\u00eame le rend <strong>invisible \u00e0 l&rsquo;\u0153il nu<\/strong>. Seules des cam\u00e9ras haute vitesse peuvent le capturer.<\/p>\n<hr \/>\n<h2>Les jets bleus : des jaillissements depuis le sommet de l&rsquo;orage<\/h2>\n<h3>Qu&rsquo;est-ce qu&rsquo;un jet bleu ?<\/h3>\n<p>Un <strong>jet bleu<\/strong> est une d\u00e9charge en forme de <strong>c\u00f4ne ou de trompette<\/strong> qui jaillit du sommet du cumulonimbus et s&rsquo;\u00e9l\u00e8ve dans la stratosph\u00e8re.<\/p>\n<h3>Caract\u00e9ristiques<\/h3>\n<ul>\n<li><strong>Point de d\u00e9part :<\/strong> sommet de l&rsquo;orage, vers <strong>15 \u2013 18 km<\/strong><\/li>\n<li><strong>Altitude atteinte :<\/strong> <strong>40 \u00e0 50 km<\/strong><\/li>\n<li><strong>Dur\u00e9e :<\/strong> quelques centaines de millisecondes<\/li>\n<li><strong>Vitesse d&rsquo;ascension :<\/strong> environ <strong>100 km\/s<\/strong><\/li>\n<li><strong>Couleur :<\/strong> bleu vif, par excitation de l&rsquo;azote ionis\u00e9<\/li>\n<\/ul>\n<h3>M\u00e9canisme<\/h3>\n<p>Contrairement \u00e0 l&rsquo;elfe, le jet bleu est une <strong>v\u00e9ritable d\u00e9charge \u00e9lectrique<\/strong>. Il r\u00e9sulte d&rsquo;un d\u00e9s\u00e9quilibre de charges au sommet du nuage : lorsque la charge positive sup\u00e9rieure n&rsquo;est pas neutralis\u00e9e par un \u00e9clair interne, la d\u00e9charge s&rsquo;\u00e9chappe vers le haut.<\/p>\n<p>Sa couleur bleue s&rsquo;explique par la composition de l&rsquo;air \u00e0 ces altitudes et par le type d&rsquo;excitation mol\u00e9culaire, diff\u00e9rent de celui qui produit le rouge des sprites.<\/p>\n<h3>Les jets g\u00e9ants<\/h3>\n<p>Variante spectaculaire, le <strong>jet g\u00e9ant<\/strong> relie directement le sommet de l&rsquo;orage \u00e0 l&rsquo;ionosph\u00e8re, atteignant <strong>80 \u00e0 90 km d&rsquo;altitude<\/strong>. Il \u00e9tablit un pont \u00e9lectrique entre la troposph\u00e8re et l&rsquo;ionosph\u00e8re, transf\u00e9rant une charge consid\u00e9rable. Ces \u00e9v\u00e9nements restent rares et sont observ\u00e9s principalement au-dessus des orages tropicaux et maritimes.<\/p>\n<hr \/>\n<h2>Les sprites : les cousins rouges<\/h2>\n<p>Impossible d&rsquo;\u00e9voquer elfes et jets bleus sans mentionner les <strong>sprites<\/strong> (ou farfadets), les TLE les plus fr\u00e9quemment photographi\u00e9s.<\/p>\n<ul>\n<li><strong>Altitude :<\/strong> 50 \u00e0 90 km<\/li>\n<li><strong>Couleur :<\/strong> rouge orang\u00e9, avec des filaments bleut\u00e9s \u00e0 la base<\/li>\n<li><strong>Forme :<\/strong> m\u00e9duse, colonne ou carotte, avec de longs tentacules descendants<\/li>\n<li><strong>Dur\u00e9e :<\/strong> quelques millisecondes \u00e0 quelques dizaines de millisecondes<\/li>\n<\/ul>\n<p>Les sprites sont d\u00e9clench\u00e9s par des <strong>\u00e9clairs positifs nuage-sol<\/strong> de tr\u00e8s forte intensit\u00e9, qui modifient brutalement le champ \u00e9lectrique au-dessus de l&rsquo;orage.<\/p>\n<\/div><!-- ELFE, JET BLEU ET SPRITE \u2014 WORDPRESS -->\n<style>\n  .mcp-tle-mini,\n  .mcp-tle-mini * { box-sizing: border-box; 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}\n\n    .mcp-tle-mini tbody th {\n      padding: 13px 15px;\n      color: #fff;\n      font-size: 16px;\n      text-align: center;\n      background: #334155;\n      border: 0;\n    }\n\n    .mcp-tle-mini tbody td {\n      position: relative;\n      min-height: 48px;\n      padding: 13px 12px 13px 39%;\n      font-size: 14px;\n      text-align: left;\n      border-right: 0;\n      border-bottom: 1px solid #e7edf4;\n    }\n\n    .mcp-tle-mini tbody td::before {\n      position: absolute;\n      top: 13px;\n      left: 12px;\n      width: 31%;\n      font-size: 11px;\n      font-weight: 900;\n      line-height: 1.25;\n      text-transform: uppercase;\n    }\n\n    .mcp-tle-mini tbody td:nth-child(2)::before { content: \"Elfe\"; color: #be123c; }\n    .mcp-tle-mini tbody td:nth-child(3)::before { content: \"Jet bleu\"; color: #1d4ed8; }\n    .mcp-tle-mini tbody td:nth-child(4)::before { content: \"Sprite\"; color: #c2410c; }\n    .mcp-tle-mini tbody td:last-child { border-bottom: 0; }\n  }\n\n  @media (max-width: 430px) {\n    .mcp-tle-mini tbody td { padding-left: 12px; }\n    .mcp-tle-mini tbody td::before {\n      position: static;\n      display: block;\n      width: auto;\n      margin-bottom: 5px;\n    }\n  }\n<\/style>\n\n<section class=\"mcp-tle-mini\" aria-labelledby=\"mcp-tle-mini-title\">\n  <h2 class=\"mcp-tle-mini__title\" id=\"mcp-tle-mini-title\">\n    Elfe, jet bleu et sprite\n    <span class=\"mcp-tle-mini__subtitle\">Trois ph\u00e9nom\u00e8nes lumineux transitoires au-dessus des orages<\/span>\n  <\/h2>\n\n  <div class=\"mcp-tle-mini__scroll\">\n    <table aria-label=\"Comparaison entre un elfe, un jet bleu et un sprite\">\n      <thead>\n        <tr>\n          <th scope=\"col\">Crit\u00e8re<\/th>\n          <th scope=\"col\">Elfe (ELVES)<\/th>\n          <th scope=\"col\">Jet bleu<\/th>\n          <th scope=\"col\">Sprite (farfadet)<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <th scope=\"row\">Altitude<\/th>\n          <td>85\u2013100 km<\/td>\n          <td>15\u201350 km<\/td>\n          <td>50\u201390 km<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Couleur<\/th>\n          <td>Rouge p\u00e2le<\/td>\n          <td>Bleu vif<\/td>\n          <td>Rouge orang\u00e9, parfois bleut\u00e9 \u00e0 la base<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Dur\u00e9e<\/th>\n          <td>< 1 ms<\/td>\n          <td>Environ 100\u2013300 ms<\/td>\n          <td>Environ 1\u2013100 ms<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Forme<\/th>\n          <td>Anneau plat en expansion<\/td>\n          <td>C\u00f4ne ascendant<\/td>\n          <td>M\u00e9duse, carotte ou colonnes<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Origine<\/th>\n          <td>Impulsion \u00e9lectromagn\u00e9tique<\/td>\n          <td>D\u00e9charge ascendante depuis le nuage<\/td>\n          <td>Champ \u00e9lectrique quasi \u00e9lectrostatique apr\u00e8s l\u2019\u00e9clair<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">\u00c9clair d\u00e9clencheur<\/th>\n          <td>\u00c9clair \u00e0 tr\u00e8s fort courant, de polarit\u00e9 positive ou n\u00e9gative<\/td>\n          <td>D\u00e9charge intranuage, sans \u00e9clair nuage-sol syst\u00e9matique<\/td>\n          <td>Le plus souvent un puissant \u00e9clair positif nuage-sol<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p class=\"mcp-tle-mini__note\">\n    <strong>\u00c0 retenir :<\/strong> l\u2019elfe est un anneau extr\u00eamement bref produit par une impulsion \u00e9lectromagn\u00e9tique ; le jet bleu s\u2019\u00e9l\u00e8ve directement depuis le sommet du nuage ; le sprite, aussi appel\u00e9 <strong>farfadet<\/strong>, appara\u00eet plus haut apr\u00e8s un \u00e9clair puissant. Les valeurs indiqu\u00e9es sont des ordres de grandeur.\n  <\/p>\n<\/section><div class=\"fusion-text fusion-text-3\"><h2>Quels orages les produisent ?<\/h2>\n<p>Les TLE ne surviennent pas au-dessus de n&rsquo;importe quelle cellule. Ils exigent des syst\u00e8mes <strong>puissants, \u00e9tendus et riches en \u00e9clairs positifs<\/strong>.<\/p>\n<p><strong>Configurations favorables :<\/strong><\/p>\n<ul>\n<li><strong>Syst\u00e8mes convectifs de m\u00e9so-\u00e9chelle (MCS)<\/strong> : vastes complexes orageux, principaux producteurs de sprites et d&rsquo;elfes<\/li>\n<li><strong>Lignes de grains<\/strong> matures, avec partie stratiforme d\u00e9velopp\u00e9e<\/li>\n<li><strong>Supercellules<\/strong> \u00e0 sommets tr\u00e8s \u00e9lev\u00e9s<\/li>\n<li><strong>Orages maritimes tropicaux<\/strong>, propices aux jets g\u00e9ants<\/li>\n<\/ul>\n<p>En France, les TLE sont document\u00e9s au-dessus des grands syst\u00e8mes orageux estivaux, notamment sur le <strong>Massif central<\/strong>, le <strong>Sud-Ouest<\/strong>, la <strong>fa\u00e7ade m\u00e9diterran\u00e9enne<\/strong> et le <strong>golfe du Lion<\/strong>.<\/p>\n<hr \/>\n<h2>Comment les observer ?<\/h2>\n<p>L&rsquo;observation des TLE reste un d\u00e9fi, mais elle est accessible aux amateurs \u00e9quip\u00e9s et m\u00e9thodiques.<\/p>\n<\/div><!-- CONDITIONS D'OBSERVATION DES FARFADETS \u2014 WORDPRESS -->\n<style>\n  .mcp-sprite-observation,\n  .mcp-sprite-observation * { box-sizing: border-box; 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}\n\n    .mcp-sprite-observation tbody tr {\n      overflow: hidden;\n      margin-bottom: 13px;\n      background: #fff;\n      border: 1px solid #d8e1ec;\n      border-radius: 13px;\n      box-shadow: 0 5px 15px rgba(15, 23, 42, .08);\n    }\n\n    .mcp-sprite-observation tbody tr:last-child { margin-bottom: 0; }\n\n    .mcp-sprite-observation tbody th {\n      padding: 13px 15px;\n      color: #fff;\n      font-size: 16px;\n      text-align: center;\n      background: linear-gradient(135deg, #1e3a8a, #4338ca);\n      border: 0;\n    }\n\n    .mcp-sprite-observation tbody td {\n      padding: 14px 15px;\n      font-size: 14px;\n      text-align: center;\n      border: 0;\n    }\n  }\n<\/style>\n\n<section class=\"mcp-sprite-observation\" aria-labelledby=\"mcp-sprite-observation-title\">\n  <h2 class=\"mcp-sprite-observation__title\" id=\"mcp-sprite-observation-title\">\n    Observer les farfadets au-dessus des orages\n    <span class=\"mcp-sprite-observation__subtitle\">Les conditions les plus favorables pour photographier les sprites<\/span>\n  <\/h2>\n\n  <div class=\"mcp-sprite-observation__table-wrap\">\n    <table aria-label=\"Conditions recommand\u00e9es pour observer les farfadets ou sprites\">\n      <thead>\n        <tr>\n          <th scope=\"col\">Param\u00e8tre<\/th>\n          <th scope=\"col\">Recommandation<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody>\n        <tr>\n          <th scope=\"row\">Distance \u00e0 l\u2019orage<\/th>\n          <td><span class=\"mcp-sprite-observation__distance\">150 \u00e0 400 km<\/span> \u2014 g\u00e9n\u00e9ralement n\u00e9cessaire pour voir au-dessus du sommet nuageux<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Ligne de vis\u00e9e<\/th>\n          <td>D\u00e9gag\u00e9e vers l\u2019orage, sans nuages au premier plan<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Ciel local<\/th>\n          <td>Parfaitement clair dans la direction observ\u00e9e<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Pollution lumineuse<\/th>\n          <td>Minimale, loin des \u00e9clairages urbains directs<\/td>\n        <\/tr>\n        <tr>\n          <th scope=\"row\">Moment<\/th>\n          <td><strong>Nuit noire<\/strong>, lorsque le contraste est maximal<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p class=\"mcp-sprite-observation__note\">\n    <strong>\u00c0 retenir :<\/strong> la plage de 150 \u00e0 400 km constitue un rep\u00e8re g\u00e9n\u00e9ralement favorable, mais elle varie selon la hauteur de l\u2019orage, le relief, la courbure terrestre et la transparence de l\u2019air. Orientez l\u2019appareil au-dessus d\u2019un orage lointain produisant de puissants \u00e9clairs.\n  <\/p>\n<\/section><div class=\"fusion-text fusion-text-4\"><h3>Le mat\u00e9riel<\/h3>\n<ul>\n<li><strong>Bo\u00eetier<\/strong> \u00e0 haute sensibilit\u00e9 ISO, capable de monter \u00e0 6400 \u2013 12800<\/li>\n<li><strong>Objectif lumineux<\/strong> (f\/1.4 \u00e0 f\/2.8), focale 24 \u2013 85 mm<\/li>\n<li><strong>Tr\u00e9pied stable<\/strong><\/li>\n<li><strong>Intervallom\u00e8tre<\/strong> pour des s\u00e9quences continues de poses de 1 \u00e0 4 secondes<\/li>\n<li>Alternative : <strong>cam\u00e9ra vid\u00e9o bas-lumi\u00e8re<\/strong> ou syst\u00e8me de d\u00e9tection automatique<\/li>\n<\/ul>\n<h3>La m\u00e9thode<\/h3>\n<ol>\n<li>Identifiez un orage actif \u00e0 bonne distance gr\u00e2ce au <strong>radar<\/strong> et aux <strong>cartes de foudre<\/strong><\/li>\n<li>Rep\u00e9rez les zones \u00e0 forte activit\u00e9 d&rsquo;<strong>\u00e9clairs positifs<\/strong><\/li>\n<li>Cadrez <strong>au-dessus<\/strong> du sommet de l&rsquo;orage, pas sur le nuage lui-m\u00eame<\/li>\n<li>Lancez une acquisition continue sur plusieurs dizaines de minutes<\/li>\n<li>Analysez les images image par image \u2014 les TLE \u00e9chappent souvent \u00e0 l&rsquo;\u0153il pendant la prise de vue<\/li>\n<\/ol>\n<p><strong>Ce qu&rsquo;il faut retenir :<\/strong> les sprites sont les plus accessibles, les jets bleus nettement plus rares, les elfes quasi impossibles \u00e0 capturer sans mat\u00e9riel scientifique d\u00e9di\u00e9.<\/p>\n<hr \/>\n<h2>Pourquoi les \u00e9tudier ?<\/h2>\n<p>Au-del\u00e0 de leur beaut\u00e9, les TLE pr\u00e9sentent un int\u00e9r\u00eat scientifique majeur.<\/p>\n<p><strong>Chimie atmosph\u00e9rique.<\/strong> Ils g\u00e9n\u00e8rent des oxydes d&rsquo;azote et modifient localement la composition de la m\u00e9sosph\u00e8re, avec des effets encore mal quantifi\u00e9s sur l&rsquo;ozone.<\/p>\n<p><strong>Couplage atmosph\u00e9rique.<\/strong> Ils d\u00e9montrent un lien \u00e9lectrique direct entre la troposph\u00e8re orageuse et l&rsquo;ionosph\u00e8re, remettant en cause l&rsquo;id\u00e9e de couches atmosph\u00e9riques ind\u00e9pendantes.<\/p>\n<p><strong>S\u00e9curit\u00e9 a\u00e9ronautique.<\/strong> Les jets bleus se produisent aux altitudes de croisi\u00e8re hautes et int\u00e9ressent l&rsquo;aviation commerciale et les futurs vols suborbitaux.<\/p>\n<p><strong>Indicateur d&rsquo;intensit\u00e9.<\/strong> La pr\u00e9sence de TLE signale des orages \u00e9lectriquement exceptionnels, information pr\u00e9cieuse pour la pr\u00e9vision imm\u00e9diate.<\/p>\n<hr \/>\n<h2>FAQ<\/h2>\n<p><strong>Peut-on voir un elfe \u00e0 l&rsquo;\u0153il nu ?<\/strong> Non. Sa dur\u00e9e inf\u00e9rieure \u00e0 la milliseconde le rend ind\u00e9tectable par la vision humaine. Seules des cam\u00e9ras haute vitesse le r\u00e9v\u00e8lent.<\/p>\n<p><strong>Les jets bleus sont-ils dangereux ?<\/strong> Pas pour les populations au sol. Ils se produisent en haute atmosph\u00e8re, mais leur interaction \u00e9ventuelle avec les a\u00e9ronefs fait l&rsquo;objet d&rsquo;\u00e9tudes.<\/p>\n<p><strong>Quelle diff\u00e9rence entre un sprite et un elfe ?<\/strong> Le sprite est une d\u00e9charge en forme de m\u00e9duse entre 50 et 90 km, durant plusieurs millisecondes. L&rsquo;elfe est un anneau plat vers 90 km, durant moins d&rsquo;une milliseconde.<\/p>\n<p><strong>Ces ph\u00e9nom\u00e8nes sont-ils fr\u00e9quents en France ?<\/strong> Oui, plus qu&rsquo;on ne l&rsquo;imagine. Les grands syst\u00e8mes orageux estivaux en produisent r\u00e9guli\u00e8rement, mais leur observation exige des conditions pr\u00e9cises.<\/p>\n<p><strong>Depuis quand les conna\u00eet-on ?<\/strong> La premi\u00e8re image d&rsquo;un sprite date de 1989, captur\u00e9e accidentellement par des chercheurs am\u00e9ricains. Les elfes ont \u00e9t\u00e9 identifi\u00e9s en 1990, les jets bleus en 1994.<\/p>\n<p><strong>Quel mat\u00e9riel minimum pour tenter l&rsquo;observation ?<\/strong> Un bo\u00eetier hybride ou reflex r\u00e9cent, un objectif f\/1.8, un tr\u00e9pied et un intervallom\u00e8tre suffisent pour esp\u00e9rer capturer un sprite.<\/p>\n<hr \/>\n<h2>Conclusion<\/h2>\n<p>Elfes, jets bleus, sprites et jets g\u00e9ants prolongent l&rsquo;orage bien au-del\u00e0 du cumulonimbus, jusqu&rsquo;aux portes de l&rsquo;espace. Invisibles ou presque, ils r\u00e9v\u00e8lent un couplage \u00e9lectrique entre les couches de l&rsquo;atmosph\u00e8re que la science n&rsquo;a commenc\u00e9 \u00e0 explorer qu&rsquo;il y a une trentaine d&rsquo;ann\u00e9es.<\/p>\n<p>Pour les rep\u00e9rer, tout commence par l&rsquo;identification des bons orages : puissants, \u00e9tendus, riches en \u00e9clairs positifs, et observ\u00e9s \u00e0 bonne distance.<\/p>\n<p><strong>Suivez l&rsquo;activit\u00e9 orageuse 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 \u00bb.\n-->\n\n<style>\n  .amo-orage-banner,\n  .amo-orage-banner * {\n    box-sizing: border-box;\n  }\n\n  .amo-orage-banner {\n    --amo-night: #07182f;\n    --amo-blue: #0a3158;\n    --amo-electric: #56d4ff;\n    --amo-yellow: #ffd447;\n    --amo-white: #ffffff;\n    width: min(1100px, 100%);\n    margin: 28px auto;\n    font-family: inherit;\n  }\n\n  .amo-orage-banner__link {\n    position: relative;\n    isolation: isolate;\n    display: grid;\n    grid-template-columns: minmax(0, 1fr) auto;\n    gap: clamp(22px, 5vw, 64px);\n    align-items: center;\n    min-height: 250px;\n    padding: clamp(30px, 6vw, 66px);\n    overflow: hidden;\n    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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":61748,"parent":61283,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_titles_title":"Elfes et jets bleus : les \u00e9clairs myst\u00e9rieux au-dessus des orages | Alertes-M\u00e9t\u00e9o","_seopress_titles_desc":"Elfes, jets bleus, sprites : d\u00e9couvrez les ph\u00e9nom\u00e8nes lumineux transitoires qui illuminent la haute atmosph\u00e8re au-dessus des orages violents.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"temperature 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