NASA scientist's new equations decipher 'mysterious' math of solar wind

Last Updated: Fri, Feb 22, 2013 08:00 hrs

For the first time, a scientist at NASA's Goddard Space Flight Center in Greenbelt, Md., has created a set of equations to describe how solar wind move.

Understanding the Sun and how the material and energy it sends out affects the solar system is crucial, since it creates a dynamic space weather system that can disrupt human technology in space such as communications and global positioning system (GPS) satellites.

However, the Sun and its prodigious stream of solar particles, called the solar wind, can be particularly tricky to model since as the material streams to the outer reaches of the solar system it carries along its own magnetic fields. The magnetic forces add an extra set of laws to incorporate when trying to determine what's governing the movement.

Indeed, until now, equations for certain aspects of the solar wind have never been successfully devised to correlate to the observations seen by instruments in space.

Now Aaron Roberts, a space scientist at Goddard, has created a set of the necessary equations.

"Since the 1970s, scientists have known that movement in the solar wind often has the characteristics of a kind of wave called an Alfven wave. Imagine you have a jump rope and you wiggle one end so that it sends waves down the rope. Alfven waves are similar, but the moving rope is a magnetic field line itself," said Aaron Roberts, a space scientist at Goddard.

The Alfven waves in this case tended to have great consistency in height-or amplitude, which is the common term when talking about waves-but they are random in direction. You might think of it like a jump rope twirling, always the same distance from center, but nonetheless able to be in many places in space.

Another way scientists have envisioned the waves is as a "random walk on a sphere." Again, always the same distance from a given center, but with a variable placement.

Such metaphorical descriptions are based on what instruments in space have, in fact, observed when they see magnetic waves go by in the solar wind. But it turns out that the equations to describe this kind of movement-equations necessary to advance scientific models of the entire system-were not easily found.

"The puzzle has been to figure out why the amplitude is so constant. But it's been very difficult to find equations that satisfy all the characteristics of the magnetic field," said Roberts.

Similar waves are, in fact, seen in light, known as polarized waves. But magnetic fields have additional constraints on what shapes and configurations are even possible. Roberts found a way to overlap numerous waves of different wavelengths in such a way that they ultimately made the variation in amplitude as small as possible.

To his surprise, the equations Roberts devised matched what was observed more closely than he'd expected. Not only did the equations show waves of constant amplitude, but they also showed occasional random jumps and sharp changes-an unexplained feature seen in the observations themselves.

Having an equation doesn't yet tell us the reason why the waves in the solar wind are shaped in this way.

Nonetheless, equations that describe how the waves move open the door to increasingly accurate simulations that may well help explain such causes.

The research was published in Physical Review Letters last year. (ANI)

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