Скачать или смотреть The Upper Atmosphere - Part 3

Watch and learn about the fascinating layers of the upper atmosphere! Subscribe for weekly videos: https://goo.gl/COrUU6

Mr. Weather’s World is a weekly video series bringing you interesting and reliable information about the Earth Sciences. Tune in each week for exciting new content with host and meteorologist Curt Silverwood (Millersville University Alum).

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The mid to upper layers of our atmosphere include the Mesosphere, Thermosphere, and Exosphere. Above the Stratosphere is called the Mesosphere.

The Mesosphere ranges from 31 to 53 miles above the Earth's surface. The boundary dividing the Stratosphere from the Mesosphere is called the stratopause.

Weather balloons and other aircraft cannot fly high enough to reach the Mesosphere, making observation and studying the Mesosphere difficult. Leaving much of this layer a mystery.

Unlike the Stratosphere, temperatures plummet in the Mesosphere, reaching negative 130 degrees Fahrenheit at the top of this layer. Gases are thicker here, and as meteors enter the atmosphere, they burn and catch fire as they fall. We observe these occurrences and refer to them as shooting stars!

Clouds usually do not form in the Mesosphere, but extraordinary Noctilucent clouds do, the highest clouds in Earth's atmosphere. They'll form near the poles during the summer months.

Above the Mesosphere is the Thermosphere.

This layer of Earth's atmosphere is from 53 miles to 311 to 621 miles above the Earth's surface. Solar activity influences the temperature in this layer. As a result, temperatures in the upper Thermosphere can range from 932 to 3632 degrees Fahrenheit or higher even though the air is so thin, making it feel freezing cold to us!

Although the Thermosphere is considered part of Earth's atmosphere, most of it could be thought of as outer space. For example, the International Space Station orbits Earth within the Thermosphere!

The Northern and Southern Lights occur in the Thermosphere. The boundary between the Thermosphere and Exosphere is called the thermopause. The exosphere is the uppermost layer of the atmosphere as it fades into the vacuum of space. This layer extends from the top of the Thermosphere to around 6,200 miles above the Earth. Many satellites orbit within both the exosphere and Thermosphere. The exosphere has no breathable air and is very cold.

Earth’s atmosphere is very thin, with its mass only about one-millionth that of the planet itself but it's still a powerful shield keeping oxygen from escaping into space and protecting us from harmful space hazards like solar radiation. Without our atmosphere, life as we know it wouldn’t exist. That’s why it's vital to protect it and reduce human impacts that weaken our atmosphere.
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