TELECOM Digest OnLine - Sorted: Solar Storms Interfere With GPS Systems

Solar Storms Interfere With GPS Systems

Barry Levine (
Wed, 18 Apr 2007 15:03:54 -0500

Barry Levine,

If you find your Global Positioning System (GPS) device acting
weirdly, the problem might be the Sun. Researchers at Cornell
University reported Wednesday that an unprecedented solar storm last
December had a serious impact on GPS and other communications systems.

The findings, presented in Washington, D.C. at the first Space Weather
Enterprise Forum, focused on a giant solar flare on December 6,
2006. It created a tremendous radio burst that caused GPS signals to
be dropped for a large number of receivers, the researchers said.

Solar flares have been known to disrupt satellite communications and
impact electricity grids before, but the researchers said the December
event was different.

'More Profound'

"In December, we found the effect on GPS receivers was more profound
and widespread than we expected," Dr. Paul Kintner, Cornell professor
of electrical and computer engineering, said in a statement. "Now we
are concerned more severe consequences will occur during the next
solar maximum." Specially designed receivers at Cornell were able to
measure the impact of solar radio bursts with an unprecedented

Although the burst occurred during a relatively quiet time in the
Sun's "weather," it produced as much as ten times more radio noise
than any previously monitored solar event, according to Dr. Dale Gray,
head of the physics department at the New Jersey Institute of
Technology (NJIT).

"Measurements with NJIT's solar radiotelescope confirmed, at its peak,
the burst produced 20,000 times more radio emission than the entire
rest of the Sun," he said in a statement. "This was enough to swamp
GPS receivers over the entire sunlit side of Earth."

The December 6 burst was so powerful, it even showed up on the civil
air navigation system, according to researchers at Boston College.

The episode demonstrates several key lessons for our technological
society, according to Dr. Anthea Coster of the MIT Haystack

We cannot, she said, become overly reliant on technology without
keeping in mind the possible effects of space weather disruptions,
which can be global and instantaneous. She pointed out that "the size
and timing of this burst were completely unexpected and the largest
ever detected. We do not know how often we can expect solar radio
bursts of this size or even larger."

Only Now Known

Solar flares produce intense bursts of radio noise, which peak in the
bands used by GPS systems. Normally, GPS signals can still be read,
because the solar noise is relatively weak. Researchers say the
problem is only now becoming known because the rapid rise of GPS
devices has occurred in a period of relatively low solar noise. A
possible solution would be to increase signal strength, but
researchers said that could mean redesigning GPS satellites.

Satellite signals are used by a GPS receiver to determine location,
speed, and direction, instantaneously and with an unprecedented
accuracy. Airplanes and ships commonly use GPS devices, and they are
indispensable for emergency rescues. Cell phones are beginning to
carry them, mapmakers commonly employ them, and even banks use them to
synchronize money transfers.

The next expected peak period for solar activity will occur in 2011
and 2012. A study published last year indicated that solar flares
during that time could cause widespread disruption to satellite-based

Copyright 2007 NewsFactor Network, Inc.

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