APOD: Noctilucent Clouds over Paris Fireworks (2018 Jul 10)

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APOD: Noctilucent Clouds over Paris Fireworks (2018 Jul 10)

Post by APOD Robot » Tue Jul 10, 2018 4:06 am

Image Noctilucent Clouds over Paris Fireworks

Explanation: It's northern noctilucent cloud season -- perhaps a time to celebrate! Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds are the highest clouds known and now established to be polar mesospheric clouds observed from the ground. Although observed with NASA's AIM satellite since 2007, much about noctilucent clouds remains unknown and so a topic of active research. The featured time-lapse video shows expansive and rippled noctilucent clouds wafting over Paris, France, during a post-sunset fireworks celebration on Bastille Day in 2009 July. This year, several locations are already reporting especially vivid displays of noctilucent clouds.

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Re: APOD: Noctilucent Clouds over Paris Fireworks (2018 Jul 10)

Post by heehaw » Tue Jul 10, 2018 8:58 am

Reminds me of when I was on a boat, in the twilight, after a day on Stromboli. I was looking toward that island's red glowings of hot lava, in the dusk, but then I was startled to see, in addition, sharp pinpricks of blue light, usually near those red patches. Took me quite a while to figure out what THAT mysterious phenomenon could possibly be caused by!