WebFrom early July until mid‐August 1995 we observed six noctilucent clouds (NLC) above the ALOMAR observatory in Northern Norway (69°N, 16°E) with ground based lidar. The NLC layers had maximum backscatter ratios between 17 and 190 at 532 nm, their mean altitude was 83.0 km. The latest of these events (August 12/13, 1995) was observed by two … Web5 de out. de 2024 · For the first time the shape of noctilucent cloud particles is analyzed with a 3-D Lagrangian model. Three-color lidar measurements are compared directly to optical modeling of NLC simulations with non-spherical shapes: a mix of elongated and flattened cylindrical ice particles consistent with measurements.
Impact of particle shape on the morphology of noctilucent clouds
Web3 de jul. de 2011 · Night-shining, or noctilucent clouds on July 3, 2011, in Lock Leven, Fife, Scotland. A NASA mission called Aeronomy of Ice in the Mesosphere, or AIM, was launched in 2007 to observe noctilucent clouds, but it currently only has a view of the clouds near the poles. Now scientists have gathered information from several other … Web13 de mar. de 2013 · What sets noctilucent clouds apart is their occurrence in the middle of the night, their very obvious pale blue colour, and their disappearance into the dawn close to the onset of civil twilight when the Sun is 6° below the horizon. as being set apart from ordinary Noctilucent clouds were first recognized clouds in 1884/1885 and in a series … lithophane kit
Noctilucent cloud Definition & Meaning - Merriam-Webster
Web5 de nov. de 2009 · Hallowe’en has come and gone, but there are still signs of spooky things afoot. Take a look at this picture — of clouds shining at night. Yes, that’s right, at night. … Web27 de jul. de 2024 · Noctilucent clouds form at high altitudes and are visible during astronomical twilight. In this image, noctilucent clouds and comet NEOWISE are visible … WebNoctilucent clouds are the highest clouds in the Earth’s atmosphere, 83 km (50 miles) and are observed slightly below the mesopause in the polar summertime. These clouds are of special interest, as they are sensitive to both global climate change and to solar/terrestrial influences. The first recorded sightings of noctilucent clouds were ... lithophane lamp kit