Strong solar storm heading for Earth

WASHINGTON Wed Mar 7, 2012 5:24pm EST

The sun erupts with one of the largest solar flares of this solar cycle in this NASA photo taken on March 6, 2012. REUTERS/NASA/SD0/AIA

The sun erupts with one of the largest solar flares of this solar cycle in this NASA photo taken on March 6, 2012.

Credit: Reuters/NASA/SD0/AIA

WASHINGTON (Reuters) - A strong geomagnetic storm is racing from the Sun toward Earth, and its expected arrival on Thursday 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 4.5 million miles per hour (7.2 million km per hour), 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 (NOAA).

This solar disturbance is a three-stage affair, or as Kunches said in a telephone interview from Boulder, Colorado: "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 impact 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 on Thursday.

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 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 mid-latitudes, which in the United States could include New York, Illinois and Iowa.

Such stormy space weather is unusual in recent history, according to Harlan Spence, an astrophysicist at the University of New Hampshire who is principal investigator on the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) aboard NASA's Lunar Reconnaissance Orbiter.

"These relatively large (solar) events, which we've had maybe a couple of handfuls total in the course of a decade, we've now had two or three of them, more or less right on top of each other," Spence said by telephone.

The Sun is on the ascendant phase of its 11-year cycle of solar activity, with the peak expected next year, scientists said.

"It's a clear harbinger that the Sun is waking up," Spence said. "We're trying to put this in context not only ... of what has the Sun done in the past, but what is the biggest thing the Sun is capable of and what should we be planning for in terms of extreme sorts of events in the future."

(Reporting By Deborah Zabarenko, Environment Correspondent; Editing by Will Dunham)

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Comments (10)
IntoTheTardis wrote:
Another scientific hoax. Next thing you know they’ll be telling us that burning millions of pounds of fossil fuels every year has an effect on the climate. What planet are these so-called scientists living on?

Mar 07, 2012 5:30pm EST  --  Report as abuse
EllieK wrote:
It isn’t a scientific hoax, but it isn’t necessarily caused by climate change and global warming (there is definitely climate change, warmer or colder doesn’t matter to me as much as the fact that it is driven by human activity, with adverse effects on our world). We’ve been tracking cyclical solar flares for over a century. They come and go in long-ish, maybe 15 or 20 year cycles. As an amateur radio operator (“ham”), it was something to be aware of, and I learned about it back then. Problem now is that we have so much more sensitivity to electromagnetic disruption. In the past there were ham’s, but there weren’t as many critical civilian satellites and electronic guidance systems.

I’m sure the experts who were quoted in this article are well aware of this, more so than I am! That’s why I’m unsettled if they say that the frequency or intensity of solar activity is increasing. I couldn’t tell if that meant it was increasing as part of the normal progression of flare periodicity. Or is this was something new? I hope it isn’t the latter.

Mar 07, 2012 6:30pm EST  --  Report as abuse
Run to the store and buy all the milk and bread you can fit in your car. Green car owners, you save again.

Mar 07, 2012 6:53pm EST  --  Report as abuse
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