Will Solar Flares Disrupt GPS Signals in 2011?

October 12, 2010

Solar Activity and its Effect on Earth 300x185 Will Solar Flares Disrupt GPS Signals in 2011?Citing research by Cornell University and others the 10 February 2010 BBC report warns: “of probable GPS signal disruption in 2011-2012. Sat-nav receivers will be blinded for tens of minutes, or more probably a few times a year at the solar maximum”.

The Daily Telegraph on 14th of June 2010 instead discloses  that senior space agency scientists believe the Earth will be hit with unprecedented levels of magnetic energy from solar flares after the Sun wakes “from a deep slumber” sometime around 2013.

The problem: an intense period of solar flares that occurs roughly every 11 years, called the solar maximum. Charged particles from flares produce intense bursts of radio noise that peak in the 1.2 and 1.6 gigahertz bands used by GPS. Usually radio noise in GPS bands is very low so receivers can pick up signals from orbiting satellites, even though GPS signals themselves are very weak. Charged particles trapped in the ionosphere can cause additional disruption. The trapped particles create wide fluctuations in the time GPS signals take to traverse the ionosphere, causing significant timing calculation errors.

Since the last solar maximum occurred roughly a decade ago, before GPS “came of age,” society has learned to rely on GPS during a period of relative solar calm. That means any disruptions that do occur over the next two years could very much be unanticipated — and unplanned for. As the solar maximum approaches, now might be a good time to reevaluate your GPS receivers’ holdover clocks. Your time can still be reliable, even when your GPS signal is not.



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