Most Popular
1. Banking Crisis is Stocks Bull Market Buying Opportunity - Nadeem_Walayat
2.The Crypto Signal for the Precious Metals Market - P_Radomski_CFA
3. One Possible Outcome to a New World Order - Raymond_Matison
4.Nvidia Blow Off Top - Flying High like the Phoenix too Close to the Sun - Nadeem_Walayat
5. Apple AAPL Stock Trend and Earnings Analysis - Nadeem_Walayat
6.AI, Stocks, and Gold Stocks – Connected After All - P_Radomski_CFA
7.Stock Market CHEAT SHEET - - Nadeem_Walayat
8.US Debt Ceiling Crisis Smoke and Mirrors Circus - Nadeem_Walayat
9.Silver Price May Explode - Avi_Gilburt
10.More US Banks Could Collapse -- A Lot More- EWI
Last 7 days
Stock Market Volatility (VIX) - 25th Mar 24
Stock Market Investor Sentiment - 25th Mar 24
The Federal Reserve Didn't Do Anything But It Had Plenty to Say - 25th Mar 24
Stock Market Breadth - 24th Mar 24
Stock Market Margin Debt Indicator - 24th Mar 24
It’s Easy to Scream Stocks Bubble! - 24th Mar 24
Stocks: What to Make of All This Insider Selling- 24th Mar 24
Money Supply Continues To Fall, Economy Worsens – Investors Don’t Care - 24th Mar 24
Get an Edge in the Crypto Market with Order Flow - 24th Mar 24
US Presidential Election Cycle and Recessions - 18th Mar 24
US Recession Already Happened in 2022! - 18th Mar 24
AI can now remember everything you say - 18th Mar 24
Bitcoin Crypto Mania 2024 - MicroStrategy MSTR Blow off Top! - 14th Mar 24
Bitcoin Gravy Train Trend Forecast 2024 - 11th Mar 24
Gold and the Long-Term Inflation Cycle - 11th Mar 24
Fed’s Next Intertest Rate Move might not align with popular consensus - 11th Mar 24
Two Reasons The Fed Manipulates Interest Rates - 11th Mar 24
US Dollar Trend 2024 - 9th Mar 2024
The Bond Trade and Interest Rates - 9th Mar 2024
Investors Don’t Believe the Gold Rally, Still Prefer General Stocks - 9th Mar 2024
Paper Gold Vs. Real Gold: It's Important to Know the Difference - 9th Mar 2024
Stocks: What This "Record Extreme" Indicator May Be Signaling - 9th Mar 2024
My 3 Favorite Trade Setups - Elliott Wave Course - 9th Mar 2024
Bitcoin Crypto Bubble Mania! - 4th Mar 2024
US Interest Rates - When WIll the Fed Pivot - 1st Mar 2024
S&P Stock Market Real Earnings Yield - 29th Feb 2024
US Unemployment is a Fake Statistic - 29th Feb 2024
U.S. financial market’s “Weimar phase” impact to your fiat and digital assets - 29th Feb 2024
What a Breakdown in Silver Mining Stocks! What an Opportunity! - 29th Feb 2024
Why AI will Soon become SA - Synthetic Intelligence - The Machine Learning Megatrend - 29th Feb 2024
Keep Calm and Carry on Buying Quantum AI Tech Stocks - 19th Feb 24

Market Oracle FREE Newsletter

How to Protect your Wealth by Investing in AI Tech Stocks

Puzzling Collapse Of Earth's Upper Atmosphere

Politics / Climate Change Jul 21, 2010 - 04:38 AM GMT

By: Global_Research

Politics

Best Financial Markets Analysis ArticleDr. Tony Phillips writes: 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.


"This is the biggest contraction of the thermosphere in at least 43 years," says John Emmert of the Naval Research Lab, lead author of a paper announcing the finding in the June 19th issue of the Geophysical Research Letters (GRL). "It's a Space Age record."

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.

"Something is going on that we do not understand," says Emmert.

The thermosphere ranges in altitude from 90 km to 600+ km. It is a realm of meteors, auroras and satellites, which skim through the thermosphere as they circle Earth. It is also where solar radiation makes first contact with our planet.

The thermosphere intercepts extreme ultraviolet (EUV) photons from the sun before they 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. (This heating can raise temperatures as high as 1400 K-hence the name thermosphere.) When solar activity is low, the opposite happens.

Lately, solar activity has been very low. In 2008 and 2009, the sun plunged into a century-class solar minimum. Sunspots were scarce, solar flares almost non-existent, and solar EUV radiation was at a low ebb. Researchers immediately turned their attention to the thermosphere to see what would happen.

How do you know what's happening all the way up in the thermosphere?

Emmert uses a clever technique: Because satellites feel aerodynamic drag when they move through the thermosphere, it is possible to monitor conditions there by watching satellites decay. He analyzed the decay rates of more than 5000 satellites ranging in altitude between 200 and 600 km and ranging in time between 1967 and 2010.

This provided a unique space-time sampling of thermospheric density, temperature, and pressure covering almost the entire Space Age. In this way he discovered that the thermospheric collapse of 2008-2009 was not only bigger than any previous collapse, but also bigger than the sun alone could explain.

One possible explanation is carbon dioxide (CO2).

When carbon dioxide gets into the thermosphere, it 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.

"But the numbers don't quite add up," says Emmert. "Even when we take CO2 into account using our best understanding of how it operates as a coolant, we cannot fully explain the thermosphere's collapse."

According to Emmert and colleagues, low solar EUV accounts for about 30% of the collapse. Extra CO2 accounts for at least another 10%. That leaves as much as 60% unaccounted for.

In their GRL paper, the authors acknowledge that the situation is complicated. There's more to it than just solar EUV and terrestrial CO2. For instance, trends in global climate could alter the composition of the thermosphere, changing its thermal properties and the way it responds to external stimuli. The overall sensitivity of the thermosphere to solar radiation could actually be increasing.

"The density anomalies," they wrote, "may signify that an as-yet-unidentified climatological tipping point involving energy balance and chemistry feedbacks has been reached."

Or not.

Important clues may be found in the way the thermosphere rebounds. Solar minimum is now coming to an end, EUV radiation is on the rise, and the thermosphere is puffing up again. Exactly how the recovery proceeds could unravel the contributions of solar vs. terrestrial sources.

"We will continue to monitor the situation," says Emmert.

NASA Science

Global Research Articles by Tony Phillips

© Copyright Dr. Tony Phillips , Global Research, 2010

Disclaimer: The views expressed in this article are the sole responsibility of the author and do not necessarily reflect those of the Centre for Research on Globalization. The contents of this article are of sole responsibility of the author(s). The Centre for Research on Globalization will not be responsible or liable for any inaccurate or incorrect statements contained in this article.


© 2005-2022 http://www.MarketOracle.co.uk - The Market Oracle is a FREE Daily Financial Markets Analysis & Forecasting online publication.


Post Comment

Only logged in users are allowed to post comments. Register/ Log in