Layers of Earth's upper atmosphere. Credit: John Emmert/NRL
Posted on 07/15/2010 9:11:25 PM PDT by NormsRevenge
An upper layer of Earth's atmosphere recently collapsed in an unexpectedly large contraction, the sheer size of which has scientists scratching their heads, NASA announced Thursday.
The layer of gas – called the thermosphere – is now rebounding again. This type of collapse is not rare, but its magnitude shocked scientists.
"This is the biggest contraction of the thermosphere in at least 43 years," said John Emmert of the Naval Research Lab, lead author of a paper announcing the finding in the June 19 issue of the journal Geophysical Research Letters. "It's a Space Age record."
The collapse occurred during a period of relative solar inactivity – called a solar minimum from 2008 to 2009. These minimums are known to cool and contract the thermosphere, however, the recent collapse was two to three times greater than low solar activity could explain.
"Something is going on that we do not understand," Emmert said.
The thermosphere lies high above the Earth's surface, close to where our planet meets the edge of space. It ranges in altitude from 55 miles (90 km) to 370 miles (600 km) above the ground. At this height, satellites and meteors fly and auroras shine. [Graphic: Earth's Atmosphere Top to Bottom]
The thermosphere interacts strongly with the sun, so is very affected by periods of high or low solar activity. This layer intercepts extreme ultraviolet light (EUV) from the sun before it can reach the ground.
When solar activity is high, solar EUV warms the thermosphere, causing it to puff up like a marshmallow held over a camp fire. When solar activity is low, the opposite occurs.
Recently, solar activity has been at an extreme low. In 2008 and 2009, sunspots were scarce, solar flares almost non-existent, and solar EUV radiation was at a low ebb.
(Excerpt) Read more at space.com ...
Layers of Earth's upper atmosphere. Credit: John Emmert/NRL
That doggone George Bush again.
You forgot to also blame whitey.
Wonder if that big solar eruption back in April would affect the atmosphere now?
It’s all those darn cracker babies....and of course W’s fault.
We’re doomed and we are all going to die!
Obama: I inherited this!
The little messiah played around and earth momma had an crude reaction contraction.
Kinda like the economy under 0bambi...
Sounds like “Climate Change” to me. No doubt about it. Kill your SUV. NOW.
“This gas acts as a coolant, shedding heat via infrared radiation. It is widely-known that CO2 levels have been increasing in Earth’s atmosphere. Extra CO2 in the thermosphere could have magnified the cooling action of solar minimum.”
Ah crap here we go again.
This time it is the high methane emissions coming from DC.
But please refer to my tagline.
Yeah, it's a complete freekin' mystery.
bookmark
turtle on a fence post did not get there on its own—
Does not know what to do once there and does not know how to get down. We have a winner- o in the WH....
“Extra CO2 in the thermosphere could have magnified the cooling action of solar minimum...”
WARMING!! I meant warming!!
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