By........Rida coool
The sun is gearing up for a major solar flip, NASA says.
In
an event that occurs once every 11 years, the magnetic field of the sun
will change its polarity in a matter of months, according new
observations by NASA-supported observatories.
The flipping of the sun's magnetic field marks the peak of the star's 11-year solar cycle and the halfway point in the sun's "solar maximum" — the peak of its solar weather cycle. NASA released a new video describing the sun's magnetic flip on Monday (Aug. 5).
"It looks like we're no more than three to four months away from a
complete field reversal," Todd Hoeksema, the director of Stanford
University's Wilcox Solar Observatory, said in a statement. "This change
will have ripple effects throughout the solar system."
As the
field shifts, the "current sheet" — a surface that radiates billions of
kilometers outward from the sun's equator — becomes very wavy, NASA
officials said. Earth orbits the sun, dipping in and out of the waves of
the current sheet. The transition from a wave to a dip can create
stormy space weather around Earth, NASA officials said.
"The sun's polar magnetic fields weaken, go to zero, and then emerge
again with the opposite polarity," Stanford solar physicist Phil
Scherrer said in a statement. "This is a regular part of the solar
cycle."
While the polarity shift can stir up some stormy weather,
it also provides extra shielding from dangerous cosmic rays. These
high-energy particles, which are accelerated by events like supernova
explosions, zip through the universe at nearly the speed of light. They
can harm satellites and astronauts in space, and the wrinkled current
sheet better protects the planet from these particles.
The
effects of the rippled sheet can also be felt throughout the solar
system, far beyond Pluto and even touching the Voyager probes near the
barrier of interstellar space.
"The sun's north pole has already
changed sign, while the south pole is racing to catch up," Scherrer
said. "Soon, however, both poles will be reversed, and the second half
of solar max will be underway."
The current solar maximum is the
weakest in 100 years, experts have said. Usually, at the height of a
solar cycle, sunspot activity increases. These dark regions on the sun's
surface can give birth to solar flares and ejections, but there have
been fewer observed sunspots this year than in the maximums of previous
cycles.
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