Another NASA vehicle also observed noctilucent clouds recently. During the day, clouds can make the temperature on Earth cooler by blocking heat from the Sun. beautiful red flower field under cloudy sky.  They can appear as featureless bands, but frequently show distinctive patterns such as streaks, wave-like undulations, and whirls. As a result, temperatures in the mesosphere can plunge to as low as -210 degrees Fahrenheit (-134 degrees Celsius). Bottom line: Noctilucent or night-shining clouds are seen during summer in Earth’s high-latitude regions. , The exhaust can be transported to the Arctic region in little over a day, although the exact mechanism of this very high-speed transport is unknown. Exodus 13:21–22 explains that God gave them the pillar of cloud by day to lead them in the way He wanted them to go and the pillar of fire by night to give light. They form in the highest reaches of the atmosphere – the mesosphere – as much as 50 miles (80 km) above the surface. They are the highest clouds discovered over the surface of a planet.
However, according to NASA's Earth Observatory, noctilucent clouds like these have been creeping farther and farther south lately.
 The sources of both the dust and the water vapour in the upper atmosphere are not known with certainty.
 A later satellite, the Solar Mesosphere Explorer, mapped the distribution of the clouds between 1981 and 1986 with its ultraviolet spectrometer.
This, along with other processes in the upper atmosphere, drives the air even higher causing it to cool even more.
 Study was limited to ground-based observations and scientists had very little knowledge of the mesosphere until the 1960s, when direct rocket measurements began. Atmosphere the clouds are still there. Noctilucent clouds can be seen from space, too.
There, ice crystals hovering about 50 miles (80 kilometers) over Earth glom onto little particles of dust from smashed-up meteorites and other windblown sources, then condense into smoky ribbons of cloud.  Although this mechanism is the cause of individual noctilucent clouds, it is not thought to be a major contributor to the phenomenon as a whole. At night, clouds can make Earth's temperature warmer by trapping heat that came from the Sun.
They form in the highest reaches of the atmosphere – the mesosphere – … They float so high in the atmosphere that they are still lit by sunlight even after the Sun has dropped below the horizon for people on the ground. We love your photos and welcome your news tips.
What are noctilucent clouds? , Ultraviolet radiation from the Sun breaks water molecules apart, reducing the amount of water available to form noctilucent clouds. New York, One in particular resembled a corkscrew and also behaved like this …” Thank you, Meeno! By Brandon Specktor 01 July 2019.
The dust is believed to come from micrometeors, although particulates from volcanoes and dust from the troposphere are also possibilities.
it cannot be seen because there is no light to refract through the clouds. If you’re at a northerly latitude, now is a good time to watch for them! This composite satellite image, centered over the North Pole, shows the gorgeous phenomenon of noctilucent clouds in action.  They occur during summer, from mid-May to mid-August in the northern hemisphere and between mid-November and mid-February in the southern hemisphere.
Cloudflare Ray ID: 5ec5c4da3fb2cda3 | Menno van der Haven reported from Waddinxveen, the Netherlands, on June 21, 2020: “Last night, the ‘evening view’ of noctilucent clouds in the northwest was quite small and weak.
Image via NASA. The image above shows a satellite view of noctilucent or “night shining” clouds on June 12, 2019.
Southern hemisphere noctilucent clouds are fainter and occur less frequently; additionally the southern hemisphere has a lower population and less land area from which to make observations. Noctilucent roughly means "night shining" in Latin.
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