The sun's magnetic field is about to flip upside down as it reverses its polarity. In August Nasa said the reversal would happen in three to four months time, although that it would be impossible to pinpoint a more specific date.
Solar physicist Todd Hoeksema from Stanford University said that the reversal would have "ripple effects" across the whole of the solar system.
According to Nasa the sun's magnetic field changes polarity approximately every 11 years. In comparison the last time the Earth's magnetic field flipped was almost 800,000 years ago.
The pole reversal happens at the peak of each solar cycle as the sun's "inner magnetic dynamo" reorganises itself. The exact internal mechanism that drives the magnetic shift is not yet entirely understood by researchers, although the sun's magnetic field has been monitored on a daily basis by Scientists at Stanford's Wilcox Solar Observatory.
This will be the fourth such shift that the observatory has monitored.
Throughout the 11 year solar cycle new polarity builds up as 'sunspots' which are areas of intense magnetic activity that appear as blotches near the equator of the sun's surface.
As to what effect this may have, scientists said it could be widespread. The sun's magnetic field exerts its influence in a wide space, known as the heliosphere. The heliosphere stretches well beyond Pluto and is as far reaching as NASA's Voyager probes close to the edge of interstellar space. During a magnetic flip the sun is also typically at its peak.
Another possible impact is that the sun's altered magnetic field could interact with the Earth's own magnetic field which could increase the number and range of auroras.