Northern Lights May Increasingly Interfere With GPS
GPS units are not infallible.
Stories abound of users blindly following poor GPS directions (based on improperly developed maps) onto train tracks, off marked roads, and even into a nasty part of town.
Now, there's a brand new problem: interference from the Northern Lights, or Aurora Borealis, the natural lightshow seen near the Earth's poles when high-speed particles from the Sun hit the atmosphere. The natural light show distorts the signals from Global Positioning Satellites (GPS) that are 12,600 miles overhead. With increasing solar activity expected in the coming years, the bright lights could foul up navigation devices at an increasing rate.
The last peak of solar activity came in 2000, which is before portable navigation devices were popular, so users haven't experienced this kind of interference to date. The next peak is expected in 2012, with increasing activity each year until then.
According to a report in the American Geophysical Union's 'International Journal of Space Weather' (their Summer Fun issue is a must-read), tests conducted in Norway during Northern Light activity showed GPS units were not able to precisely identify the roads the researchers were on. Sometimes the units lost their signal entirely.
The global positioning satellites hover in fixed positions 12,600 miles above sea level. For the portable navigation units that people use in their cars, boats and planes to work, they must be able to receive unimpeded signals from these satellites. When the Northern Lights are in play, the Earth's ionosphere gets "lumpy," rendering the signals inaccurate.
Navigation device makers say this won't cause a dangerous situation for drivers as long as they use common sense while behind the wheel. So, mainly, the same common sense that (we hope) will keep you from driving off the road into a river, either. [Source: Telegraph.co.uk.]
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