They become visible about the same time as the brightest stars appear and often stay visible after dark because they are still reflecting sunlight due to their great height.
Introducing the RASC Robotic Telescope editing contest This field is for validation purposes and should be left unchanged.This field is for validation purposes and should be left unchanged. Now THAT is midnight blue: See the night sky lit up by rare noctilucent clouds that form 50 miles up in the atmosphere. Jeanine Holowatuik’s breaktaking image of noctilucent clouds won Photo of the Week June 26, 2020.That’s what one of the judges said about Jeanine Holowatuik’s breaktaking image of noctilucent clouds, which wins Photo of the Week June 26, 2020.Shooting from Greenwater Lake Provincial Park, Saskatchewan, Holowatuik said she took the image June 7, 2020 at 11:15 p.m. She said she used a one-second shutter, ISO 400, f/3.2 at 50mm. | Noctilucent – or night-shining – clouds just after midnight on June 16, 2020. Link to post I have photos of them from a few separate nights and have seen them many more times. We love your photos and welcome your news tips. As a result, temperatures in the mesosphere can plunge to as low as -210 degrees Fahrenheit (-134 degrees Celsius). Noctilucent clouds are clouds of icy dust that form at very high altitude on the edge of space, around 76–85km high, when temperatures and pressures in the upper atmosphere are just right. Noctilucent clouds – or NLCs – are not visible all the time; there is an NLC season between the end of May and the start of August every year. Noctilucent clouds by Jeanine Holowatuik Shooting from Greenwater Lake Provincial Park, Saskatchewan, Holowatuik said she took the image June 7, 2020 at 11:15 p.m. She said she used a one-second shutter, ISO 400, f/3.2 at 50mm. Unfortunately NLC’s are about as unpredictable as normal clouds ! Image via Bottom line: Noctilucent or night-shining clouds are seen during summer in Earth’s high-latitude regions. You actually get the coldest temperatures of the year near the poles in summer at that height in the mesosphere. It lights up the northern horizon so brightly.”The very honourable mention this week goes to Shakeel Anwar for his beautifully-composed image of the Venus-Moon conjunction as seen from Mississauga, Ontario on June 19. View at EarthSky Community Photos. Anwar said he used a Canon 6D mounted on 8″ Meade SCT. June 2019 has been a beautiful month for seeing noctilucent – or night-shining – clouds.
Calgarians were treated to a rare display of shimmering noctilucent clouds above the city on Thursday night, and took to social media to share the phenomenon. Low temperatures are easily attainable in the Mesosphere, but water vapour and dust are in short supply. A clear, crisp image of Melotte 15, taken by Dave Dev at last year’s Starfest, took the top spot in our Photo of the Week contest July 3, 2020. Perhaps it is not the time you want to be partially covering your face.Beachgoers are urged to avoid busy areas, as temperatures in parts of the UK reached 36.4C (97.52F).Up to 20 houses are buried under debris in the state of Kerala, with rescue efforts under way.Dozens of people are moved from an area below a weakened Mont Blanc glacier.New research says that the lockdown, by itself, will make little difference to climate change.Iraqis struggle in the sweltering heat with temperatures soaring above 50C this week.All times are BST (Europe/London, GMT +0100) unless otherwise stated. They are seen less often in the southern hemisphere as there is very little land and very few people there. Canada's magazine of astronomy and stargazing available in print and digital editions.Canada's magazine of astronomy and stargazing in print or digital. Illustration via NASA.Why do these clouds – which require such cold temperatures – form in the summer? They are visible only when illuminated by sunlight from below the horizon during twilight.Temperatures are forecast to top 30C in some parts of the UK this weekend.