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NASA grand challenge

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Researchers awarded grant to study energy transport from the sun

 

NASA has awarded a $1.2 million grant to CAS physicists William Matthaeus (left) and Michael Shay to explore energy transport from the sun.

We couldnt survive on Earth without our shining star the sun 93 million miles away..Yet we have much to learn about the environment called the heliosphere that surrounds the sun and planets like a giant teardrop, extending past Earth and beyond Neptune to the edge of the solar system. Its a place where the solar wind flows and solar storms occur, sending out billions of volts of energy.

Knowing more about the heliosphere matters, says University of Delaware physicist William Matthaeus, if we ever want to build a space station on the moon, send astronauts to Mars, continuously protect satellites and electrical systems on Earth, and even factor in the effects of space weather on our changing climate. 

Matthaeus and co-investigator Michael Shay, an associate professor in UDs Department of Physics and Astronomy, have been awarded a three-year, $1.2 million grant from NASAs Heliophysics Grand Challenges Program to explore how energy from the sun is transported across the heliosphere.

Scientists Arcadi Ismanov and Melvyn Goldstein from NASAs Goddard Space Flight Center and Vadim Roytershteyn at the Space Sciences Institute also will collaborate on the project.

The UD team will draw on their expertise in theoretical physics and reconnection physics, respectively, to develop simulation models of solar energy transport from macro- to micro-scales, ranging from the global solar wind to microscopic movement of space plasma, which makes up the solar wind, stars and lightning.

Were working to explain something in nature that has never been explained before, says Matthaeus. 

The coupling between these different regimes is one of the most fundamental problems in space physics and one of the greatest ones, notes Shay, who will be using supercomputers across the country to do the massive calculations required in the research.

The projects cross-scale couplings will involve turbulence theory and modeling, plasma physics theory and kinetic plasma simulation. 

Recently, Matthaeus and Shay met with experts in ocean sciences, engineering, and other fields to create a new working group on the UD campus. Turbulence Research on Environmental and Astrophysical Transport (TREAT) will examine issues of turbulence, the violent movement of air and water, and also investigate how findings about ocean wave flow may inform space science and the propagation of the solar wind. 

Sometimes bursts of solar wind coronal mass ejections shake Earth so hard they cause reconnection events, Matthaeus says, referring to the crossing and reconnecting of the magnetic fields that travel in opposite directions at the planets poles. 

Thats when large amounts of energetic solar wind particles, trapped by Earths magnetic field, are accelerated toward Earth. These high-energy particles can potentially knock out satellites, disrupting communications, take out power grids, and cause planes to be re-routed from flying over the poles to avoid exposing pilots and passengers to harmful radiation.

We really want to understand the place our planet has in the universe, and the first thing is to understand its place in the neighborhood, Matthaeus says.

To view simulations of space plasma and magnetic reconnection, visit the scientists web page.

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Physicist's findings about space plasma become 'classics'

 

NASA's Solar Dynamics Laboratory captured this image of the sun spurting plasma--the fourth state of matter--on May 27, 2014.

The Journal of Plasma Physics (JPP), issued by Cambridge University Press, recently selected the top 12 articles it has published, and Matthaeus has two on the list. He studies the properties and energy of space plasma, the fourth state of matter and the most abundant form of matter in the universe. It makes up most stars including our sun, as well as the solar wind that flows across the solar system. 

Unlike ordinary gases, plasmas are good electrical conductors, Matthaeus says. Their electromagnetic force is so strong it can lead to rather unexpected behavior. 

The surface of the sun is 6,600 degrees Kelvin, but if you move a few hundred thousand meters above the surface, the temperature goes over a million degrees Kelvin, which is pretty weird, he notes. 

Of Matthaeus two articles highlighted by JPP, he published Anisotropy in MHD Turbulence Due to a Mean Magnetic Field with co-authors John V. Shebalin and David Montgomery in 1983, and The Equations of Reduced Magnetohydrodynamics with Gary P. Zank in 1992. The former article has had over 500 citations and the latter more than 100 citations, according to the Thomson Reuters Web of Science.

The journals editorial board has made the top 12 articles, referred to as Classic JPP Papers, available free on its website. 

JPP publishes primary research articles in plasma physics, both theoretical and experimental, and its applications. Basic topics include the fundamental physics of plasmas, ionization, kinetic theory, particle orbits, stochastic dynamics, wave propagation, solitons, stability, shock waves, transport, heating and diagnostics. Applications include fusion, laboratory plasmas and communications devices, laser plasmas, technological plasmas, space physics and astrophysics.

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Physicists William Matthaeus and Michael Shay have been awarded a grant from NASA to explore how energy from the sun is transported across the heliosphere.
6/25/2014
 
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