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Found 2 results

  1. With NASA`s AIM spacecraft beginning to publish it`s Northern hemisphere images...although not likely to show for a couple of weeks now seems the right time to start this topic below are the latest predictions for the upcoming NLC season SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids WWW.SPACEWEATHER.COM NOCTILUCENT CLOUD FORECAST: Last summer, sky watchers in the northern hemisphere witnessed the finest outbreak of noctilucent clouds (NLCs) ever. Normally confined to polar regions, the rippling blue clouds spread as far south as Las Vegas, Nevada, and Los Angeles, California, smashing old records for low-latitude visibility. One of the brightest displays occurred over Paris, France: "On June 21, 2019, the day of the summer solstice, these rare noctilucent clouds were visible over Paris," says photographer Kulik Bertrand. "It was amazing!" NLCs are Earth's highest clouds. Seeded by meteoroids, they float at the edge of space more than 80 km above the ground. The clouds form when summertime wisps of water vapor rise up to the mesosphere, allowing water to crystallize around specks of meteor smoke. Given that 2019 was such a record-breaker, researchers are naturally wondering what will happen in 2020. Could NLCs spread even farther south? To try to answer that question, Lynn Harvey of the University of Colorado's Laboratory for Atmospheric and Space Physics has taken a look at data from NASA's Microwave Limb Sounder (MLS). She prepared the following plots, which show moisture and temperature in the mesosphere for the past 14 years--including 2020: Moisture and temperature are key ingredients of NLCs. The clouds flourish when the mesosphere is cold and wet. Harvey's plots show 2020 (red) splitting right down the middle of other recent years. "So far, 2020 is shaping up to be fairly average," says Harvey. In other words, 2020 does not look a repeat of 2019. No one will know for sure, however, until NLC season actually begins. Daily images of NLCs from NASA's AIM spacecraft are posted right here on Spaceweather.com. "Based on the MLS data, I would guess that the first NLCs will be spotted in two weeks or so," she says. Stay tuned to see if the forecast is correct! Realtime Noctilucent Cloud Photo Gallery Free: Spaceweather.com Newsletter
  2. And the season begins, a few sightings in UK already. @NLCalerts #NLC2019 @NLCnet New blog https://www.netweather.tv/weather-forecasts/news/9607-what-are-noctilucent-clouds-also-known-as-nlcs-or-polar-mesospheric-clouds-pmcs Noctilucent clouds are rapidly spreading around the Arctic Circle. First sighted by NASA's AIM spacecraft on May 20th, small wisps of electric blue have since multiplied in areal coverage by a factor of nearly 200. SpaceWeather UK 09/10 June 2019 UK 25th
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