Moonrise Crossing an Inversion Layer Showing the Rare Lunar Red Flash
Alqueva´s Dark Sky Reserve | Atmospheric & Optical phenomena | By Year: 2021 | Moon in close up | Moonlight Scenes | Moontrails | The Moon | Time Lapses Photography | Twilight Dawn & Dusk
The image and video time lapse shows the full moonrise of last June 24, 2021, vividly orange in color above a hill made by rocky wastes from an extraction of marble, in Borba. In the foreground, blurred greenish hues belongs to a vineyard which is out of focus in the frame for being not faraway from my 600mm telephoto lens. Above the horizon, a sequence of shots shows the moon rising while seems to immerse into a layer of strong temperature inversion, where warm air is above colder air, creating the right conditions to show a rare phenomenon known as lunar “red flash”. On the second moon of the still photo sequence, is visible a red flash below the disc, appearing detach from the main body itself. Expert Les Cowley explains on his Atmospheric Optics website, “when crossing the layers, light rays bend so that they are reflected up and down. This phenomenon is the result of mirages and color separation. We usually see a green flash when the Sun or Moon dips down into the inversion.The near horizon moon has an upper green rim (green because much blue light is scattered away) and a lower red rim. A mirage is needed to magnify these into a green or red flash. The “Etruscan Vase” or “Omega mirage” is formed by refraction across the temperature/density gradients of warm air beneath cooler.” .
PT: A imagem e vídeo time lapse, revelam o nascer da lua cheia no passado dia 24 de Junho de 2021, com uma cor vívida laranja, acima de uma colina formada por resíduos rochosos de uma extração de mármore, em Borba. No primeiro plano, os tons esverdeados pertencem a uma vinha que está desfocado no enquadramento por não estar muito longe da minha teleobjetiva de 600 mm. Acima do horizonte, uma sequência de fotos mostra a lua nascendo enquanto parece imergir de uma camada com uma forte inversão de temperatura, onde o ar quente está acima do ar mais frio, criando as condições certas para mostrar um fenómeno raro, conhecido como “flash vermelho” lunar. Na segunda lua da sequência fotográfica estática, é visível um pequeno “flash” vermelho alongado logo abaixo do limbo, que se parece desprender do próprio disco lunar. O especialista britânico Les Cowley explica no seu site Atmospheric Optics, “ao cruzar as camadas, os raios de luz curvam-se de modo que são refletidos para cima e para baixo. Este fenómeno é o resultado de miragens e separação de cores. Normalmente vemos um flash verde quando o Sol ou a Lua mergulha na inversão. A lua próxima do horizonte, tem uma borda verde superior (verde porque muita da luz azul é espalhada) e uma borda vermelha inferior. Uma miragem é no entanto necessária para ampliar actuante como uma lente gigante, tornando assim visível o flash verde ou vermelho. O “Etruscan Vase” ou “Miragem Omega” é formado pela refração através dos gradientes de temperatura – densidade do ar quente abaixo do mais frio. “.
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