Once limited to higher latitudes, polar mesospheric clouds are becoming brighter and more visible over mid-latitudes. An astronaut aboard the International Space Station (ISS) took this oblique photograph of polar mesospheric clouds during one of the 16 sunsets visible from the station each day.
Polar mesospheric clouds are the highest-altitude clouds in Earth’s atmosphere and form at altitudes of just over 80 kilometers . The clouds are visible to people and instruments at ground level up to low-Earth orbit. They are especially accentuated in images from the space station due to the crew’s side-on view across a less-dense part of the atmosphere., the lowest layer of the atmosphere extending from ground level to an altitude of about 10 kilometers .
Polar mesospheric clouds are best seen at dawn or dusk when the Sun is between 6 and 16 degreesand illuminates the clouds from below. These clouds have historically been seen only in higher latitude regions—usually greater than 50 degrees north or 50 degrees south—during each hemisphere’s summer months. But in recent years, polar mesospheric clouds have become brighter and more visible to observers in middle latitudes.
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