Strong solar storm heading for Earth
A strong geomagnetic storm is racing from the Sun toward Earth, and its expected arrival today could affect power grids, airplane routes and space-based satellite navigation systems, U.S. space weather experts said.
The storm, a big cloud of charged particles flung from the Sun at about 7.2 million km/h, was spawned by a pair of solar flares, scientists said.
This is probably the strongest such event in nearly six years, and is likely more intense than a similar storm in late January, said Joseph Kunches, a space weather specialist at the U.S. National Oceanic and Atmospheric Administration.
This solar disturbance is a three-stage affair, or as Kunches said in a telephone interview from Boulder, Colo.: “We hit the trifecta.”
These are the stages he described, with the first two already affecting Earth:
First, two solar flares moving at nearly the speed of light reached Earth late on Tuesday. Such flares can cause radio blackouts.
Then, solar radiation hit Earth’s magnetic field on Wednesday, with possible effect on air traffic, especially near the poles, satellites and any astronauts taking space walks. This phase could last for days.
Finally, the plasma cloud sent by the coronal mass ejection, which is basically a big chunk of the Sun’s atmosphere, is expected to arrive at Earth early today.
This phase can disrupt power grids, satellites, oil pipelines and high-accuracy GPS systems used by oil drillers, surveyors and some agricultural operations, scientists said.
GPS systems used for less-refined functions, such as the turn-by-turn navigation found in many cars, should not be affected, according to the NOAA’S Doug Biesiecker.
Kunches said the geomagnetic component of the storm may arrive a bit ahead of schedule because it follows a previous storm that left the Sun on Sunday and is currently buffeting the Earth’s magnetosphere.
“When you’ve already had one coronal mass ejection storm, sometimes the next coronal mass ejection storm is faster to get here,” Kunches said.
These storms could produce some vivid auroras, according to experts.
In the Northern Hemisphere, the aurora borealis could be visible at midlatitudes, perhaps as far south as the U.S. states of New York, Illinois and Iowa.
The Sun is on the ascendant phase of its 11-year cycle of solar activity, with the peak expected next year, scientists said.