Scientists around the world will be watching very closely for three eruptions from the Sun reach the Earth over Thursday and Friday.
These "coronal mass ejections" will slam into Earth's magnetic shield.
The wave of solar charged particles are the result of three solar flares aimed at Earth in recent days, including the most powerful since 2006.
The largest flares can disrupt the technology, including power grids, communications systems and satellites.
Northern Lights (Aurora Borealis) can also be more visible to the south is usually the case - including the northern parts of the UK.
"Our current view is that the effect of solar flare can reach Earth later today (Thursday GMT), possibly tomorrow morning," said Alan Thomson, director of geomagnetism at the British Geological Survey (BGS).
He told the BBC: "In the scientific community, there is a feeling that is not as severe as initially thought it might be, but it is still possible it could be a pretty big event for us to see the aurora borealis in the UK. .
However, weather forecasts suggested cloudiness could market views of any aurora.
Technological impact
U.S. National Oceanic and Atmospheric Administration (NOAA) said that three of the coronal mass ejections (CMEs) were on their way, as a result of solar flares on 13, 14 and 15 February (GMT).
"The last of the three seems to be the fastest and can take much of the pioneers in the late morning and noon, February 17," read a statement from the NOAA Space Weather Prediction Center.
The outbreak in 0156 GMT on 15 February was the strongest such event in four years, according to U.S. space agency (NASA), which has been monitoring activity on the sun. The case was classified as a so-called X-class solar flare, the most intense.
The source of the three events, sunspot 1158, has expanded rapidly in recent days.
Solar flares are caused by sudden release of magnetic energy stored in the solar atmosphere.
Its effects can interfere with modern technology on Earth, such as power grids, communications systems and satellites - including satellite navigation (or satellite navigation) of signals.
Although scientists expect more geomagnetic activity occurring on Thursday, state media reported China and some disruption to communications shortwave radio in the south.
Awakening Sun
In 1972, a geomagnetic storm caused by solar flare eliminated long distance telephone communications through the U.S. the state of Illinois. And in 1989, another storm sank six million people in the dark through the Canadian province of Quebec.
Dr. Thomson said that the infrastructure could be affected this time, but stressed: "The X-class flare was observed that the other day was smaller in magnitude than similar eruptions have been associated with technological damage, the loss of Quebec's power grid ... and even the great magnetic storm in 2003, which caused some damage to satellites in orbit. "
Scientists will have about half an hour notice that the wave of charged particles is about to hit Earth's magnetic shield.
This is taken from the point where a NASA satellite called ACE (Advanced Composition Explorer) records solar radiation on their instruments: "We're sitting waiting for the event happen," said Dr. Thompson.
The researchers say that the Sun has been an awakening after a period of several years of low activity.
