From the Sidney Morning Herald The gist of it:
A powerful solar eruption that triggered a huge geomagnetic storm has disturbed radio comms and could disrupt electrical power grids, radio and satellite communication in the next days, NASA said.
A strong wave of charged plasma emanating from the Jupiter-sized sun spot, the most powerful seen in four years, has already disrupted radio communication in southern China.
The Class X flash — the largest such category — erupted at 0156 GMT Tuesday, according to the US space agency. “X-class flares are the most powerful of all solar events that can trigger radio blackouts and long-lasting radiation storms…
Geomagnetic storms usually last 24 to 48 hours — but some could last for many days…”Ground to air, ship to shore, short-wave broadcast and amateur radio are vulnerable to disruption during geomagnetic storms. Navigation systems like GPS can also be adversely affected.”
NASA’s Solar Dynamics Observatory said it saw a large coronal mass ejection (CME) associated with the flash blasting toward Earth at about 560 miles per second (900 kilometers per second).
“The calm before the storm,” “Three CMEs are enroute, all a part of the Radio Blackout events on February 13, 14, and 15 (UTC). The last of the three seems to be the fastest and may catch both of the forerunners about mid to late … February 17.”
The China Meteorological Administration [CMA] reported that the solar flare caused “sudden ionospheric disturbances” in the atmosphere above China and jammed short-wave radio communications in the southern part of the country. The CMA warned there was a high probability that large solar flares would appear over the next three days,
The British Geological Survey  said meanwhile that the solar storm would result in spectacular Northern Lights displays starting Thursday.