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Solar Bursts May Threaten GPS

 
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5savages
Geocacher


Joined: 13 Feb 2005

Posts: 204

PostPosted: Wed Apr 04, 2007 1:59 pm    Post subject: Solar Bursts May Threaten GPS Reply with quote

From Breitbart.com

Solar Bursts May Threaten GPS
Apr 4 02:16 PM US/Eastern
By RANDOLPH E. SCHMID
AP Science Writer

WASHINGTON (AP) - The Global Positioning System, relied on for everything from navigating cars and airplanes to transferring money between banks, may be threatened by powerful solar flares, a panel of scientists warned Wednesday.

"Our increasingly technologically dependent society is becoming increasingly vulnerable to space weather," David L. Johnson, director of the National Weather Service, said at a briefing.

GPS receivers have become widely used in recent years, using satellite signals in navigating airplanes, ships and automobiles, and in using cell phones, mining, surveying and many other commercial uses.

Indeed, banks use the system to synchronize money transfers, "so space weather can affect all of us, right down to our wallet," said Anthea J. Coster, an atmospheric scientist at the Haystack Observatory of the Massachusetts Institute of Technology.

The cause for their concern, Johnson said, was an unexpected solar radio burst on Dec. 6 that affected virtually every GPS receiver on the lighted half of Earth. Some receivers had a reduction in accuracy while others completely lost the ability to determine position, he said.

Solar activity rises and falls in 11-year cycles, with the next peak expected in 2011.

If that increasing level of activity produces more such radio bursts the GPS system could be seriously affected, the researchers said.

And protecting the system is no simple task, added Paul M. Kintner Jr., a professor of electrical engineering at Cornell University, who monitored the December event.

There are two possible ways to shield the system, he said, both very expensive. Either alter all GPS antennas to screen out solar signals or replace all of the GPS satellites with ones that broadcast a stronger signal.

That's why it's essential to learn more about the sun's behavior quickly in an effort to find ways to predict such events, the researchers said.

In addition to the GPS system, the December solar flare affected satellites and induced unexpected currents in the electrical grid, Johnson said.

"The effects were more profound than we expected and more widespread than we expected," added Kintner.

Dale E. Gary, chairman of the physics department of the New Jersey Institute of Technology, said the burst produced 10 times more radio noise than any burst previously recorded.

The difference between that burst and normal solar radio emissions "was like the difference between the noise level of a normal conversation and the noise level in the front row of a rock concert," he said.

"This is a wake-up call" to improve technology, commented Anthony J. Mannucci, group supervisor at NASA's Jet Propulsion Laboratory.

Patricia H. Doherty, co-director of the Institute for Scientific Research at Boston College, said the burst affected but did not shut down the Federal Aviation Administration's Wide Area Augmentation System, which uses GPS signals to assist in navigation.

Most of the WAAS ground stations were able to maintain contact with enough satellites to continue working, though their accuracy was somewhat affected, she said.

The stations have to maintain contact with at least four satellites to work, but usually monitor at least 10 to increase their accuracy, she said. Most were able to meet the minimum, she said.

The briefing came at a Space Weather Enterprise Forum convened by the National Oceanic and Atmospheric Administration to discuss the effects of solar activity. Because of its increasing importance, Johnson said, the Weather Service's Space Environment Center was converted from a mainly research center in 2005 to an operational center reporting on solar activity and its impacts.
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KC0GRN
Past MnGCA Board


Joined: 22 Feb 2004

Posts: 1424

PostPosted: Wed Apr 04, 2007 2:04 pm    Post subject: Reply with quote

I usually blame my inability to find a cache on Solar Flares messing with my GPS accuracy Laughing
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Marsha and Silent Bob
Past MnGCA President


Joined: 02 Sep 2003

Posts: 6261

PostPosted: Wed Apr 04, 2007 2:09 pm    Post subject: Reply with quote

KC0GRN wrote:
I usually blame my inability to find a cache on Solar Flares messing with my GPS accuracy Laughing

My excuse is that I just suck at caching.
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Paklid
Past MnGCA Board


Joined: 09 May 2004

Posts: 656

PostPosted: Wed Apr 04, 2007 3:20 pm    Post subject: Reply with quote

Well, I guess this makes me look like a genius for wearing aluminum foil underwear for the past couple of years. Besides the obvious comfort factor, I'm able to patch into a ready made antenna at any time with the comfort of knowing that I'm fully protected where it matters most.
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bflentje
Geocacher


Joined: 29 May 2006

Posts: 4030

PostPosted: Fri Apr 06, 2007 10:02 am    Post subject: Reply with quote

I am blaming solar activity for your global climate change. Then I am compared to a holocaust denier. I guess that should some other forum.. sigh.
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