{ "version": 1, "id": "sky-test-halos", "tags": [ "halo", "atmospheric optics", "ice crystals" ], "description": { "fr": "Un ciel d'essai pour le cortège des halos. Rien ici n'est une forme posée : un prisme hexagonal de glace et la loi de Snell suffisent à tout produire, et aucun angle n'a été choisi. Le Soleil est à 20° de hauteur. Au départ, un voile de cirrus couvre 85 % du ciel et les cristaux tombent bien à plat (alignement 95 %) : anneau à 22°, parhélies de part et d'autre, arc tangent, circumzénithal, cercle parhélique. Puis le temps change sous vos yeux. De 10 à 19 s, les cristaux se mettent à tourbillonner (alignement 20 %) : parhélies et arcs s'éteignent, l'anneau reste ; ce réglage, que nul relevé au monde ne contient, décide à lui seul de ce qu'on voit. Ils se stabilisent de nouveau jusqu'à 26 s. De 26 à 31 s, le voile s'amincit à 25 % : le halo ne subsiste que par fragments, là où il reste de la glace. Il s'épaissit de nouveau jusqu'à 37 s, puis une couche de cumulus passe en dessous (70 % à 41 s) et cache le spectacle avant de se dissiper.", "en": "A test sky for the halo display. Nothing here is a placed shape: a hexagonal ice prism and Snell's law produce all of it, and not one angle was chosen. The Sun is 20° up. At first a veil of cirrus covers 85% of the sky and the crystals fall well flat (95% alignment): the 22° ring, sundogs on either side, the tangent arc, the circumzenithal arc, the parhelic circle. Then the weather changes as you watch. From 10 to 19 s the crystals start to tumble (20% alignment): the sundogs and arcs go out and the ring stays; that setting, which no meteorological record in the world contains, alone decides what one sees. They settle again until 26 s. From 26 to 31 s the veil thins to 25%: the display survives only in fragments, where there is still ice. It thickens again until 37 s, then a layer of cumulus passes beneath (70% at 41 s) and hides the show before clearing.", "es": "Un cielo de prueba para el despliegue de halos. Aquí nada es una forma colocada: un prisma hexagonal de hielo y la ley de Snell lo producen todo, y no se ha elegido ni un solo ángulo. El Sol está a 20° de altura. Al principio un velo de cirros cubre el 85% del cielo y los cristales caen bien planos (95% de alineación): el anillo de 22°, parhelios a ambos lados, el arco tangente, el arco circuncenital, el círculo parhélico. Luego el tiempo cambia ante tus ojos. De 10 a 19 s los cristales empiezan a dar tumbos (20% de alineación): los parhelios y los arcos se apagan y el anillo se queda; ese ajuste, que ningún registro meteorológico del mundo contiene, decide por sí solo lo que se ve. Vuelven a asentarse hasta los 26 s. De 26 a 31 s el velo se adelgaza hasta el 25%: el despliegue solo sobrevive a fragmentos, donde aún hay hielo. Vuelve a espesarse hasta los 37 s, y luego una capa de cúmulos pasa por debajo (70% a los 41 s) y oculta el espectáculo antes de despejarse.", "it": "Un cielo di prova per lo spettacolo degli aloni. Nulla qui è una forma posizionata: un prisma esagonale di ghiaccio e la legge di Snell producono tutto, e non è stato scelto un solo angolo. Il Sole è a 20° di altezza. All'inizio un velo di cirri copre l'85% del cielo e i cristalli cadono ben piatti (95% di allineamento): l'anello di 22°, i pareli ai due lati, l'arco tangente, l'arco circumzenitale, il cerchio parelico. Poi il tempo cambia sotto i tuoi occhi. Da 10 a 19 s i cristalli cominciano a ruzzolare (20% di allineamento): i pareli e gli archi si spengono e l'anello resta; quel parametro, che nessun archivio meteorologico al mondo contiene, decide da solo ciò che si vede. Si stabilizzano di nuovo fino a 26 s. Da 26 a 31 s il velo si assottiglia al 25%: lo spettacolo sopravvive solo a frammenti, dove c'è ancora ghiaccio. Si ispessisce di nuovo fino a 37 s, poi uno strato di cumuli passa sotto (70% a 41 s) e nasconde lo spettacolo prima di diradarsi." }, "time": { "year": 2020, "month": 1, "day": 15, "hour": 12, "minute": 50 }, "utcOffsetHours": 1, "durationSeconds": 46, "place": [ { "lat": 48.8566, "lng": 2.3522, "name": "Paris, France" } ], "weatherTrack": { "keyframes": [ { "t": 0, "weather": { "cloudLayers": [ { "id": "halo-cirrus", "type": "cirrus", "baseM": 8000, "thicknessM": 400, "coverage": 0.85, "sizeM": 2200, "density": 0.35, "darkness": 0.05, "iceCrystalAlignment": 0.95, "seed": 41 }, { "id": "low-cumulus", "type": "cumulus", "baseM": 1500, "thicknessM": 800, "coverage": 0, "sizeM": 1400, "density": 1, "darkness": 0.15, "seed": 17 } ], "cloudCover": 0.85, "cloudDarkness": 0.05, "cloudBaseM": 8000, "lowerCloudCover": 0, "highCloudCover": 0.85, "iceCrystalAlignment": 0.95, "precipitationType": "none", "precipitationIntensity": 0, "windDirectionDeg": 90, "windSpeed": 4, "storm": false } }, { 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