The sun unleashed a significant X-class solar flare at 1:32 p.m. EST on
Jan. 7, 2014 -- the first major flare of 2014. The moment was preceded
by a mid-level flare earlier during the day, with both events taking
place over a different region of a sizable sunspot group, currently
positioned over the center of the sun.
SDOs Helioseismic and Magnetic Imager shows active regions on the sun, AR1944 and AR1943
.
Solar
flares are characterized by a sudden brightening over the Sun's
surface, culminating in a large output of energy, and are very
frequently followed by coronal mass ejections (CMEs). Each flare
forcefully ejects large clouds of ions, electrons and atoms through the
sun's corona and into space. Solar flares are known to occur frequently
around active regions near sunspots -- relatively cool, dark regions on
the surface of the sun; it is believed the powerful magnetic fields of
sunspots create a connection between the solar interior and the corona,
with flares driven by the rapid release of magnetic energy that builds
up in the corona.
The latest solar flare was classified as an
X1.2-class flare. X-class represents the most intense of all flares, and
the number conveys information that specifically relates to the flare's
strength. For example, an X2 demonstrates twice the intensity of an X1,
whereas an X3 has three times the intensity of an X1 solar flare. The
weakest known flares are categorized as A-class, followed by B-class,
C-class, then M-class flares, in order of increasing intensity.
A
large coronal mass ejection has reached Earth -- days after the Sun
sent a massive burst of solar wind and electromagnetic radiation towards
our planet. While causing no major geomagnetic storm, it has produced
spectacular auroras in northern Europe.
The coronal mass ejection
(CME) arrived near Earth at 2:32pm EST (7:32pm GMT) on Thursday, with
its effects expected to continue throughout Friday, according to US
National Oceanic and Atmospheric Administration (NOAA).
NOAA's
Space Weather Prediction Center has issued a warning of a geomagnetic
storm with "minor disruptions to communications and GPS."
While
the world's economies braced for possible blackouts in high-frequency
airline and military communications, disruptions to GPS signals and
power grids, enthusiasts in the northern hemisphere rushed outdoors in
the hope of viewing the stunning aurora borealis as far south as
Colorado.
However, American aurora spotters have been
disappointed, as, according to spaceweather.com, the CME's impact was
"weaker than expected" and failed to produce widespread storms. Some
frustrated Twitter users also blamed cloudy skies for not being able to
see the northern lights.
Observers were luckier around the
Arctic Circle in Norway, where a dark and clear night at the time of
impact, as well as more favorable latitude, put an aurora on display.
NOAA
forecasters still estimated an 85 percent chance of polar geomagnetic
storms before the end of Friday, and media cheered the sky watchers by
saying there remains a chance of some clear aurora sightings Friday
night.
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The CME that stroke
the Earth has been associated with the large X1.2-class solar flare that
was unleashed from a giant sunspot AR1944 on January 7. The flare has
been described as the most powerful this year so far, with X-class
denoting the most severe intensity.
Sunspots of this magnitude
are common, Murtagh said, especially in the current 11-year "solar
maximum" of activity. In previous cycles of maximum activity in 2003,
the sun had a flare that reached about X35 or 35 times larger than this
recent flare, according to John Kappenman of Storm Analysis Consultants.
"Fortunately
[it was] not directed towards the Earth," Kappenman said. "It saturated
NOAA's X Ray sensors it was so off the charts large... it would be this
class flare or a combination of several larger flares (like X5 to X10
level) over a period of several days that are most likely to give rise
to a really big storm like the Carrington Event of 1859 or the 1921
Railroad Storm."
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