Solar flares can cause a complete GPS signal blackout on the sunlit side of the Earth's surface. In 2006 flares on the 5th and 6th of December caused profound and severe effects to GPS receivers causing a large number of them to stop tracking satellites. Professor Dale Gary of the New Jersey Institute of Technology said 'This solar radio burst occurred during a solar minimum, yet produced as much as 10 times more radio noise than the previous record ... at its peak, the burst produced 20 000 times more radio emission than the entire rest of the Sun. This was enough to swamp GPS receivers over the entire sunlit side of the Earth'.
The Solar flare cycle covers a period of 11 years.
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