NASAs THEMIS Discovers New Process that Protects Earth from Space Weather March 6, 2014 In the giant system that connects Earth to the sun, one key event happens over and over: solar material streams toward Earth and the giant magnetic bubble around Earth, the magnetosphere helps keep it at bay. The parameters, however, change: The particles streaming in could be from the constant solar wind, or perhaps from a giant cloud erupting off the sun called a coronal mass ejection, or CME. Sometimes the configuration is such that the magnetosphere blocks almost all the material, other times the connection is long and strong, allowing much material in. Understanding just what circumstances lead to what results is a key part of protecting our orbiting spacecraft from the effects of such space weather. Animated representation of plasmaasphere expanding. NASAs THEMIS mission observed how dense particles normally near Earth in a layer of the uppermost atmosphere called the plasmasphere can send a plume up through space to help protect against incoming solar particles during certain space weather events. Image Credit: NASA/Goddard Space Flight Center Now, for the first time, a study shows that in certain circumstances a pool of dense particles normally circling Earth, deep inside the magnetosphere, can extend a long arm out to meet – and help block – incoming solar material. It’s like what you might do if a monster tried to break into your house. You’d stack furniture up against the front door, and that’s close to what the Earth is doing here, said Brian Walsh, a space scientist at NASAs Goddard Space Flight Center in Greenbelt, Md. The material that is usually much nearer Earth stacks up against the outer boundary of the magnetosphere, throttling the interaction there and stopping solar material from entering. In the March 6, 2014, issue of Science Express, Walsh and his colleagues compared observations from the ground and in space during a solar storm on Jan. 17, 2013. This was a fairly moderate solar storm caused by a CME impacting Earths magnetosphere for several hours. As the CME encountered the boundary of the magnetosphere, its magnetic fields and those around Earth realigned in a process called magnetic reconnection, which allowed energy and solar material to cross the boundary into the magnetosphere. NASAs three THEMIS – for Time History of Events and Macroscale Interactions during Substorms – spacecraft were in the right place at the right time, flying through the magnetospheres boundary approximately 45 minutes apart, and caught this interaction. A thin layer of cold, dense material called the plasmasphere surrounds Earth. A thin layer of cold, dense material called the plasmasphere surrounds Earth. Researchers have found that material in the plasmasphere can help prevent particles from the sun crossing into near Earth space. Image Credit: NASA Closer to Earth, scientists could also study the sphere of cold dense gas at the very top of our atmosphere. This region is called the plasmasphere and its made of whats known as plasma, a gas made of charged particles. GPS signals travel through the plasmasphere and they travel at different speeds depending on how thick or thin the plasmasphere is along the journey. Tracking the GPS radio signals, therefore, can help researchers map out the properties of the plasmasphere. A colleague who works with these kind of observations said I had to see some interesting data showing a plume from the ground, said Walsh. And I typed in the dates and saw that it was a date when THEMIS was in the right position. So, for the first time, we could make a comparison. Artists rendition of the THEMIS spacecraft in orbit in Earths magnetosphere. Artists rendition of the THEMIS spacecraft in orbit in Earths magnetosphere. Image Credit: NASA THEMIS showed that the tongue of this cold, dense plasmasphere material stretched all the way up to the magnetic reconnection point where the CME had made contact with the magnetopause. The three sets of THEMIS observations demonstrated that the plume had a dramatic impact on the characteristics of the magnetic reconnection region. It wouldnt work if the magnetic reconnection happened for only a few minutes, said David Sibeck the project scientist for THEMIS at NASA Goddard. But if it lasts long enough, the whole magnetosphere gets involved. This tongue of the plasmasphere surges out, adding another layer of protection, curbing the magnetic reconnection. As scientists try to better understand the space weather system around Earth, they rely on multipoint observations such as this to connect whats seen on the ground to whats seen in space. In this case THEMIS data connected to GPS data, but such combinations are increasingly being used to watch how Earth is affected by its closest star. Eventually such observations could lead to improvements in space weather predictions, which would be as useful for spacecraft operators as terrestrial weather forecasts are for us here on Earth. For more information about NASA’s THEMIS mission, visit: nasa.gov/themis
Posted on: Mon, 24 Mar 2014 02:29:48 +0000
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