New discovery on magnetic reconnection to impact future space missions

Jan 23, 2008
New discovery on magnetic reconnection to impact future space missions
This figure shows the trajectory of a Cluster satellite (Rumba) overlaid on a numerical simulation of an electron diffusion region in the magnetosheath. The axes represent the distance from the core of the magnetic reconnection process, where the kink occurs, in between the thin blue jet and the red jet. Credits: University of Delaware (M. Shay)

ESA’s Cluster mission has, for the first time, observed the extent of the region that triggers magnetic reconnection, and it is much larger than previously thought. This gives future space missions a much better chance of studying it.

Space is filled with plasma (a gas composed of ions and electrons, globally neutral) and is threaded by magnetic fields. These magnetic fields store energy which can be released explosively, in a process called magnetic reconnection.

This process plays a key role in numerous astrophysical phenomena: star formation, solar flares and intense aurorae, to name a few. On Earth, magnetic reconnection prevents the efficient production of electricity in controlled fusion reactors, potential sources of electricity for the future.

At the heart of magnetic reconnection is the ‘electron diffusion region’, where reconnection is thought to be triggered. Here, a kink in newly-reconnected magnetic field lines produces large-scale high-velocity jets of plasma.

“Understanding the structure of the diffusion region and its role in controlling the rate at which magnetic energy is converted into particle energy remains a key scientific challenge,” says Dr Michael Shay, University of Delaware, USA.

Until recently, theoretical scientists believed that the electron diffusion region was relatively tiny (width about 2 km, length about 10 km). In the vastness of space, the chance of a spacecraft encountering this region would therefore be exceedingly small.

With increased computational power, simulations showed electron diffusion regions that were a lot more elongated than those seen earlier. It was not possible to judge whether the new finding was real because the length of the region increased with more powerful simulations. Nor it was known whether such a layer would be stable in the real, 3D world.

On 14 January 2003, the four Cluster satellites were crossing the magnetosheath, a turbulent plasma region located just outside Earth’s magnetosphere, when they encountered an electron diffusion region. The length of the observed region measured 3000 km, 300 times longer than the earlier theoretical expectations and four times longer than seen in recent simulations. Nevertheless, the observations strongly support new simulations.

“These Cluster observations are very significant since they are the first measurements of the length of the electron diffusion region in the space environment. The finding drastically changes the way we understand the physics of reconnection,” noted Dr James Drake, University of Maryland, USA.

“This discovery of a large electron diffusion region gives future ESA and NASA missions a much better chance to study it,” said Tai Phan at the University of California at Berkeley, USA, lead author of the paper on the findings.

Cluster was able to detect the region based on its high-resolution magnetic field, electric field and ion measurements. But to understand the fundamental physics of the electron diffusion region responsible for reconnection, higher time resolution measurements are needed to resolve the layer.

The four spacecraft of NASA’s Magnetospheric Multi-Scale mission, planned for launch in 2014, are being designed for such measurements. Cross-scale, a mission under study at ESA in collaboration with other space agencies, would use 12 spacecraft to probe the diffusion region, whilst simultaneously measuring the consequences of energy released by reconnection in the surrounding environment.

“With the higher probability of encountering the electron diffusion region, we can be confident that future missions will be able to fully understand magnetic reconnection,” said Dr Philippe Escoubet, ESA’s Cluster and Double Star Project Scientist and Cross-scale Study Scientist.

The findings appear in, ‘Evidence for an elongated (> 60 ion skin depths) electron diffusion region during fast magnetic reconnection,’ by T. Phan, J. Drake, M. Shay, F. Mozer and J. Eastwood, published in the Physical Review Letters, on 21 December 2007.

Source: ESA

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User comments : 5

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brant
2 / 5 (9) Jan 23, 2008
Unfortunately there is no such thing as magnetic reconnection.

Electric reconnection, yes.

The electric current flow creates the magnetic field. So if the current changes, the magnetic field changes.
seanpu
2.2 / 5 (6) Jan 24, 2008
thats pretty obvious. there is no such thing as a magnetic field line. magnetic fields are generated by movement of electrons and ions. that a magnetic field is separate and distinguishable from matter that created it is absurd. that these field lines can reconnect is to play with abstractions and detract from the truth of the situation.
mgmirkin
1 / 5 (1) Jan 24, 2008
I refer all to James Clerk Maxwell and electromagnetism on this one:

http://en.wikiped..._Maxwell
http://en.wikiped...ic_field

>>>>The electromagnetic field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz Force Law.
mgmirkin
1.5 / 5 (2) Jan 24, 2008
I refer all to James Clerk Maxwell and electromagnetism on this one:

http://en.wikiped..._Maxwell
http://en.wikiped...ic_field

>>>>The electromagnetic field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz Force Law.


Want an answer to mysterious magnetic anomalies, look to the powering electric currents. Electric charge is to the electric field as electric current is to the magnetic field!
LearmSceince
5 / 5 (2) Jan 31, 2008
that a magnetic field is separate and distinguishable from matter that created it is absurd.
and
Unfortunately there is no such thing as magnetic reconnection.

Just because you don't know physics and don't immediately grasp something with your intuition does not mean it is all wrong! Maxwell's equations show that electric and magnetic fields DO exist on their own, and can be self-sustaining and propagating. That gives the electromagnetic radiation model of light! What do you think the cluster crafts have been studying all this time? Science works. Science lets engineers build things that work.

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