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Blobrana


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A Puzzling Collapse of Earth's Upper Atmosphere

NASA-funded researchers are monitoring a big event in our planet's atmosphere. High above Earth's surface where the atmosphere meets space, a rarefied layer of gas called "the thermosphere" recently collapsed and now is rebounding again.
The collapse happened during the deep solar minimum of 2008-2009 - a fact which comes as little surprise to researchers. The thermosphere always cools and contracts when solar activity is low. In this case, however, the magnitude of the collapse was two to three times greater than low solar activity could explain.
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Blobrana


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Posts: 131433
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The thermosphere is the layer of the earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation causes ionisation.
The International Space Station has a stable orbit within the upper part of the thermosphere, between 320 and 380 kilometres. The auroras also occur in the thermosphere.

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