![]() ![]() This could be a sign of increasing greenhouse gases in Earth’s atmosphere.ĭata from AIM show that NLCs are like a great “geophysical light bulb.” They turn on every year in late spring, reaching almost full intensity over a period of no more than 5 to 10 days. In recent years they have intensified and spread with sightings as far south as Utah and Colorado. In the past, NLCs were a polar phenomenon confined mainly to the Arctic. One thing is clear, the dust behind the clouds we see now is space dust. Researchers aren’t sure what role Krakatoa’s ash played in those early sightings. They’re still present today, stronger than ever. NASA Awards Contracts for NOAA Coronagraph Instrument Phase A. Scientists of the day guessed they were some manifestation of volcanic dust.Įventually Krakatoa’s ash settled and the sunsets faded, but strangely the noctilucent clouds didn’t go away. The Deep Space Climate Observatory, or DSCOVR, was launched in February of 2015. Ash from the Indonesian volcano caused such splendid sunsets that evening sky watching became a worldwide pastime. Well be in touch with the latest information on how President Biden and his administration are working for the American people, as well as. Northern sky watchers first noticed them in 1885 about two years after the eruption of Krakatoa. Noctilucent clouds are a mystery dating back to the late 19th century. When sunbeams hit those crystals, they glow electric-blue. The clouds are very cold and filled with tiny ice crystals. Seeded by meteoroids, they float at the edge of space more than 80 km above Earth’s surface. The first clouds appeared on May 19, 2015, a bit earlier than researchers expected. The sighting marks the beginning of the 2015 season for noctilucent clouds (NLCs). NASA’s Aeronomy of Ice in the Mesosphere, or AIM, spacecraft has spotted a luminous patch of electric-blue drifting across the Arctic Circle. ![]() 4, 2023 News NASA’s Perseverance Captures Dust-Filled Martian Whirlwind The six-wheeled geologist spotted the twister as part of an atmospheric exploration of Jezero Crater. NASA's AIM spacecraft has spotted a luminous patch of electric-blue drifting across the Arctic Circle. The public can register to attend launch virtually.
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