{"product_id":"coronix-pixel-hoodie","title":"Coronix – The Forbidden Fe XIV Coronal Line Pixel Hoodie","description":"\u003cp\u003eCoronix, a knight in blackened iron, wears a crown of 13 broken spikes against an eclipsed Sun, each tip burning coronal green.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eThe green coronal line at 530.3 nm (5302.86 Å in air), seen at total eclipses, was blamed on an unknown element, “coronium”. Walter Grotrian (1939) matched the red 637.4 nm line to Fe X, and Bengt Edlén (announced 1941, full paper in \u003cem\u003eZ. Astrophys.\u003c\/em\u003e 22, 30, 1942) identified the green line as Fe XIV: iron with 13 of its 26 electrons stripped away, Fe¹³⁺. The transition is the magnetic-dipole decay ²P°\u003csub\u003e3\/2\u003c\/sub\u003e → ²P°\u003csub\u003e1\/2\u003c\/sub\u003e inside the 3s²3p ground term, a fine-structure flip that an electric dipole cannot drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFe + 13 ionisations → Fe¹³⁺ (Fe XIV)\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eχ(Fe¹²⁺ → Fe¹³⁺) ≈ 361 eV ≫ k\u003csub\u003eB\u003c\/sub\u003eT\u003csub\u003ephotosphere\u003c\/sub\u003e ≈ 0.5 eV\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFe XIV: spectroscopic notation for the ion with 13 electrons removed (Roman numeral = charge + 1)\u003c\/li\u003e\n\u003cli\u003eχ: ionisation energy needed to remove the 13th electron (eV)\u003c\/li\u003e\n\u003cli\u003ek\u003csub\u003eB\u003c\/sub\u003e: Boltzmann constant, 1.380 649 × 10⁻²³ J K⁻¹ (exact)\u003c\/li\u003e\n\u003cli\u003eT\u003csub\u003ephotosphere\u003c\/sub\u003e: temperature of the visible solar surface, about 5800 K\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMaking Fe¹³⁺ in collisional equilibrium needs electron temperatures of about a million kelvin or more, so the identification proved the corona is far hotter than the surface below it. Sources: B. Edlén, \u003cem\u003eMNRAS\u003c\/em\u003e 105, 323 (1945), doi:10.1093\/mnras\/105.6.323; W. Grotrian, \u003cem\u003eNaturwiss.\u003c\/em\u003e 27, 214 (1939); P. Swings, \u003cem\u003eApJ\u003c\/em\u003e 98, 116 (1943); NIST Atomic Spectra Database (Fe XIV).\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e Why the corona is so hot (the coronal heating problem) is still unsolved; wave heating and many small reconnection events (“nanoflares”) are both studied. The ionisation-energy figure is from the NIST database and rounded.\u003c\/p\u003e\u003cp\u003eThe glow is the approximate line colour: a pure spectral colour lies outside the sRGB range a print can show.\u003c\/p\u003e\u003ch3\u003eIn character\u003c\/h3\u003e\u003cp\u003e\u003cem\u003eThirteen spikes, thirteen electrons surrendered to a million-kelvin crown. They named me coronium. I am iron that refused to stay cool.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eOn the hoodie\u003c\/h3\u003e\u003cp\u003eFront: an eclipsed disc emblem with a green ring and pixel “XIV”. Back: Coronix in full pixel art with “FORBIDDEN. OBSERVED ANYWAY.” and “CORONIUM WAS IRON.” Gildan 18500 Heavy Blend hoodie, Black, S to 5XL.\u003c\/p\u003e\u003cp\u003ePart of the \u003cstrong\u003eForbidden Transitions\u003c\/strong\u003e set with \u003ca href=\"\/hi\/products\/nebulia-pixel-hoodie\"\u003eNebulia\u003c\/a\u003e, \u003ca href=\"\/hi\/products\/flipwarden-pixel-hoodie\"\u003eFlipwarden\u003c\/a\u003e, \u003ca href=\"\/hi\/products\/viridael-pixel-hoodie\"\u003eViridael\u003c\/a\u003e, \u003ca href=\"\/hi\/products\/sanguora-pixel-hoodie\"\u003eSanguora\u003c\/a\u003e, \u003ca href=\"\/hi\/products\/sulphra-pixel-hoodie\"\u003eSulphra\u003c\/a\u003e. Browse all \u003ca href=\"\/hi\/collections\/hoodies\"\u003ephysics hoodies\u003c\/a\u003e, more \u003ca href=\"\/hi\/collections\/astrophysics\"\u003eastrophysics \u0026amp; cosmology designs\u003c\/a\u003e, or the \u003ca href=\"\/hi\/collections\/deep-cuts\"\u003eDeep Cuts\u003c\/a\u003e.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"Black \/ S","offer_id":50964465156199,"sku":"11321626474428457629","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ M","offer_id":50964465188967,"sku":"16887944514829888669","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ L","offer_id":50964465221735,"sku":"30752224223844355610","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL","offer_id":50964465254503,"sku":"13968668967395919465","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 2XL","offer_id":50964465287271,"sku":"27594334369793468256","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 3XL","offer_id":50964465320039,"sku":"28271541142016493123","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 4XL","offer_id":50964465352807,"sku":"15837063366898941815","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 5XL","offer_id":50964465385575,"sku":"28835126505246358574","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/03_H13.png?v=1793678366","url":"https:\/\/pixelatedphysics.com\/hi\/products\/coronix-pixel-hoodie","provider":"Pixelated Physics","version":"1.0","type":"link"}