The scientists recorded noctilucent clouds at an altitude of 80km

Clouds of blue and white light form in the middle stratum, where most of the meteors were burned down to Earth.

AIM satellite (NASA) detected the first noctilucent clouds this summer in the Arctic on 17/5. Over the next week, they quickly spread and spread out in the sky. This is the second early cloud season ever recorded and is expected to last until mid-August.

These seasonal clouds hover at very high altitudes, about 80km, in the middle stratum of the atmosphere. Most meteors burn when they reach this floor because the amount of gas on it is enough to turn them into smog.

These clouds reflect the Sun, emitting blue and white light.

Noctilucent clouds form when water molecules gather around tiny dust particles and freeze, forming ice crystals. These clouds reflect the Sun, emitting blue and white light. Each year they will appear in the summer, respectively between May in the Northern Hemisphere and mid-November in the Southern Hemisphere. At that time, the middle stratum was the wettest due to the heat pushing up the humid air.

"The beginning of the cloud season is a big event for us, happening twice a year. We are excited to be trying to find out why the cloud season started and what it means in the vast atmosphere. more, " said Jim Russell, AIM supervisory expert at Hampton University.

Noctilucent clouds are also known as polar middle clouds because they often appear around the poles of the Earth. They provide more information on the middle layer and its link to other atmospheres, weather and climate.

Scientists are eagerly awaiting to see what this year's Arctic cloud season will bring. Although often moving around the pole, sometimes noctilucent clouds also drift south. Last year they drifted very far, to southern California and Oklahoma. These are the lowest latitudes where noctilucent clouds have been recorded.

The new cloud season is an opportunity for scientists to learn about noctilucent clouds and their ability to move south. There is some evidence that this may be the result of changing atmospheric conditions.