Noctilucent Clouds over The Bering Sea & Central Alaska | Earth Science
Astrophotographer Jared Aicher: "The evening sky over the Bering Sea and central Alaska was completely veiled by noctilucent clouds last night. The view from the flight deck lasted for a couple of hours as the sunset slowly turned to sunrise with nightfall never actually arriving at 63 degrees north latitude."
At high latitudes in the summer months, iridescent clouds form in a part of the atmosphere roughly 50 to 86 kilometers (30 to 54 miles) above the surface of our planet. Their high altitude allows them to reflect sunlight after the Sun has set. These are called noctilucent or polar mesospheric clouds.
Noctilucent clouds (NLCs), or night shining clouds are tenuous cloud-like phenomena in the upper atmosphere. They consist of ice crystals and from the ground are only visible during astronomical twilight. Noctilucent roughly means "night shining" in Latin. They are most often observed during the summer months from latitudes between ±50° and ±70°. Too faint to be seen in daylight, they are visible only when the observer and the lower layers of the atmosphere are in Earth's shadow while these very high clouds are still in sunlight. Recent studies suggest that increased atmospheric methane emissions produce additional water vapor through chemical reactions once the methane molecules reach the mesosphere—creating, or reinforcing existing, noctilucent clouds.
The Bering Sea is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasses on Earth: Eurasia and the Americas. It comprises a deep water basin that then rises through a narrow slope into the shallower water above the continental shelves. The Bering Sea is named after Vitus Bering, a Danish-born Russian navigator, that in 1728, was the first European to systematically explore it, sailing from the Pacific Ocean northward to the Arctic Ocean.
Alaska is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is considered to be the northernmost, westernmost, and easternmost state in the United States. It borders the Canadian territory of the Yukon and the province of British Columbia to the east. It shares a western maritime border in the Bering Strait with Russia. The Chukchi and Beaufort Seas of the Arctic Ocean lie to the north, and the Pacific Ocean lies to the south.
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