The source of that storm—and others like it—was the sun's magnetic field, described by invisible field lines that protrude from and loop
back into the burning ball of gas. Sometimes these field lines break—snapping like a rubber band pulled too tight—and join with other nearby lines,
releasing energy that can then launch bursts of plasma known as sol ar flares. Huge chunks of plasma from the sun's surface can zip toward Earth and damage orbiting satellites or bump them off their paths.
These chunks of plasma, called coronal mass ejections, can also snap Earth's magnetic field lines, causing charged particles
to speed toward Earth's magnetic poles; this, in turn, sets off the shimmering light shows we know as the
northern and southern lights.
Even though the process of field lines breaking and merging with other lines—called magnetic reconnection—has such significant effects, a
detailed picture of what precisely is going on has long eluded scientists, says Paul Bellan, professor of applied physics in the Division of Engineering
and Applied Science at the California Institute of Technology (Caltech).
Now, using high-speed cameras to look at jets of plasma in the lab, Bellan and graduate student Auna Moser have discovered a surprising phenomenon
that provides clues to just how magnetic reconnection occurs.
They describe their results in a paper published in the February 16 issue of the journal Nature.
"Trying to understand nature by using engineering techniques is indeed a hallmark of the Division of Engineering and Applied Science at Caltech,"
says Ares Rosakis, the Theodore von Kármán Professor of Aeronautics and professor of mechanical engineering and the chair of engineering and applied science.
In the experiments, Moser fired jets of hydrogen, nitrogen, and argon plasmas at speeds of about 10 to 50 kilometers per second across a distance of
more than 20 centimeters in a vacuum. Plasma is a gas so hot that atoms are stripped of their electrons. As a throughway for speeding electrons, the j
ets act like electrical wires. The experiment requires 200 million watts of power to produce jets that are a scorching 20,000 degrees Kelvin and carry a current of 100,000 amps. To study the jets, Moser used cameras that can take a snapshot in less than a microsecond, or one millionth of a second.
As in all electrical currents, the flowing electrons in the plasma jet generate a magnetic field, which then exerts a force on the plasma.
These electromagnetic interactions between the magnetic field and the plasma can cause the jet to writhe and form a rapidly expanding corkscrew.
This behavior, called a kink instability, has been studied for nearly 60 years, Bellan says.
But when Moser looked closely at this behavior in her experimental plasma jets, she saw something entirely unexpected.
She found that—more often than not—the corkscrew shape that developed in her jets grew exponentially and extremely fast.
The jets in the experiment formed 20-centimeter-long coils in just 20 to 25 microseconds. She also noticed tiny ripples that began appearing on the inner edge of the coil just before the jet broke—the moment when there was a magnetic reconnection.
In the beginning, Moser and Bellan say, they did not know what they were seeing—they just knew it was strange.
"I thought it was a measurement error," Bellan says. "But it was way too reproducible. We were seeing it day in and day out. At first,
I thought we would never figure it out."
But after months of additional experiments, they determined that the kink instability actually spawns a completely different kind of
phenomenon, called a Rayleigh-Taylor instability. A Rayleigh-Taylor instability happens when a heavy fluid that sits on top of a light
fluid tries to trade places with the light fluid. Ripples form and grow at the interface between the two, allowing the fluids to swap places.
An argon plasma jet forms a rapidly growing corkscrew, known as a kink instability. This instability causes an even faster-developing behavior
called a Rayleigh-Taylor instability, in which ripples grow and tear the jet apart. This phenomenon, the Caltech researchers say, has never been
seen before and could be important in understanding solar flares and in developing nuclear fusion as a future energy source.
Credit: A. L. Moser and P. M. Bellan, Caltech
What Moser and Bellan realized is that the kink instability creates conditions that give rise to a Rayleigh-Taylor instability.
As the coiled plasma expands—due to the kink instability—it accelerates outward. Just like a passenger being pushed back into
the seat of an accelerating car, the accelerated plasma is pushed down on the vacuum behind it. The plasma tries to swap places with the trailing vacuum by forming ripples that then expand—just like when gravity forces a heavy fluid to try to change places with a light fluid underneath. The Rayleigh-Taylor instability—as revealed by the ripples on the trailing side of the accelerating plasma—grows in about a microsecond.
"People have not observed anything like this before," Bellan says.
Although the Rayleigh-Taylor instability has been studied for more than 100 years, no one had considered the possibility that
it could be caused by a kink instability, Bellan says. The two types of instabilities are so different that to see them so
closely coupled was a shock. "Nobody ever thought there was a connection," he says.
What is notable is that the two instabilities occur at very different scales, the researchers say. While the coil created
by the kink instability spans about 20 centimeters, the Rayleigh-Taylor instability is much smaller, making ripples just
two centimeters long. Still, those smaller ripples rapidly erode the jet, forcing the electrons to flow faster and faster through a narrowing channel.
"You're basically choking it off," Bellan explains. Soon, the jet breaks, causing a magnetic reconnection.
Magnetic reconnection on the sun often involves phenomena that span scales from a million meters to just a few meters.
At the larger scales, the physics is relatively simple and straightforward. But at the smaller scales, the physics
becomes more subtle and complex—and it is in this regime that magnetic reconnection takes place. Magnetic reconnection is also a
key issue in developing thermonuclear fusion as a future energy source using plasmas in the laboratory. One of the key advances in
this study, the researchers say, is being able to relate phenomena at large scales, such as the kink instability, to those at small
scales, such as the Rayleigh-Taylor instability.
The researchers note that, although kink and Rayleigh-Taylor instabilities may not drive magnetic reconnection in all cases,
this mechanism is a plausible explanation for at least some scenarios in nature and the lab.
MessageToEagle.com via California Institute of Technology
Giant Jupiter - Our "Would-Be" Friend With Secrets From The Past
It knocked a giant planet into deep space, swallowed up a smaller rival before it could grow any bigger.
Careful observers saw dark spots rapidly changing places and almost a century ago, a luminous protuberance on the eastern edge of Jupiter,
on the equatorial side of the north equatorial belt was reported.
Unusual Pulsar Or Alien Signals?
The pulse timing of this object is considered unusual.
What kind of phenomenon is related to this object?
It is the first time this kind of phenomenon has been observed by astronomers.
The "Cloaked" Star Was Difficult To Find
An object obscured by dust, and buried in a two-star system enshrouded by dense gas, is not easy to find.
A "cloaked" star was discovered after it ate a little of its neighbor. The meal must have given the star a bit of indigestion, because it
"burped" with a blast of high-energy radiation, which gave it away.
Radio Emission From Ultracool Dwarf Detected By Arecibo Telescope
The Arecibo Telescope in Puerto Rico has discovered sporadic bursts of polarized radio emission from the T6.5 brown J1047+21.
Because Arecibo is a single, fixed-dish telescope, it has a restricted practical sensitivity to weak, quiescent emission from radio sources...
Invader From Another Galaxy
This alien intruder from another galaxy is in many ways different from other exoplanets observed by astronomers.
Located about 2000 light-years from Earth in the southern constellation of Fornax (the Furnace), the Jupiter-like planet orbits a dying star of
extragalactic origin and risks to be engulfed by it.
Power To See Most Distant Objects In The Universe
The 3C294, is one of the most distant galaxies recorded by Chandra, the most sophisticated X-ray observatory ever built.
The cluster 3C294 is even 40 percent farther (!) than the next most distant x-ray galaxy cluster.
Chandra focus on X-rays from high-energy regions of the Universe and see the invisible.
It is so sensitive that it can capture images of particles as they disappear into a black hole deep in outer space.
"Pillars Of Creation" Are Gone
Every time you look at the beautiful and famous image of the Pillars of Creation taken by Hubble back in 1995,
you are actually admiring something that no longer exists.
In fact, the Pillars of Creation were already long gone by the time the image was captured!