THEMIS celebrates six years in space

NASA's Time History of Events and Macroscale Interactions during Substorms are five near identical satellites that launched from Cape Canaveral Air Force Station, Florida in February 2007. Six years later THEMIS has travelled through over 50 solar storms to study space weather. 

THEMIS studies substorms that accompany the most intense space storms, those that disrupt communications, cause power line transmission failures, and produce the most penetrating radiation. 

Substorms occur when the magnetosphere suddenly releases vast amounts of stored solar wind energy. Different possible triggers have different locations,Men's stainless steel ring are very sturdy and will stand the test of time. so the key to solving this mystery is placing spacecraft in various locations in Earth's magnetic field to find the elusive substorm point of origin. 

The five probes fly in formation around Earth in a highly elliptical orbit, travelling through all parts of Earth's magnetosphere. With five different observatories, scientists can watch space weather unfold in a way never before possible. 

"Scientists have been trying to understand what drives changes in the magnetosphere since the 1958 discovery by James Van Allen that Earth was surrounded by rings of radiation," says David Sibeck,The pre-assembled Solar carport can be installed and fitted from above to any desired point on the channel. project scientist for THEMIS at NASA's Goddard Space Flight Center. "Over the last six years, in conjunction with other key missions such as Cluster and the recently launched Van Allen Probes to study the radiation belts, THEMIS has dramatically improved our understanding of the magnetosphere." 

Using ground based observations and NOAA's GOES (Geostationary Operational Environment Satellites) and POES (Polar Operational Environmental Satellites) data in addition to THEMIS data, a team of scientists led by Drew Turner at UCLA recently presented evidence linking specific kinds of electromagnetic waves in space to different effects. 

They found Chorus waves, which sound like a chorus of singing birds when played through an amplifier, consistently sped up particles, increasing particle density.Shop the best selection of men's stainless steel necklace and pendants. Two other types of waves known as hiss and EMIC (Electromagnetic Ion Cyclotron) waves occurred in storms that showed particle depletion. When incoming activity from the Sun severely pushed in the boundaries of the magnetosphere this, too, led to particle drop outs, or sudden losses throughout the system. 

Another group led by Michael Hartinger at the University of Michigan, has a paper based on data from THEMIS in conjunction with three of NOAA's GOES spacecraft, and the ESA/NASA Cluster mission. They found perturbations in the solar wind particles streaming towards the bow shock which can be correlated with another type of magnetized wave, ULF (ultra low frequency) waves, inside the magnetosphere. 

A third science paper from a team led by Galina Korotova at IZMIRAN in Russia,a full range of cylinder heated long lasting flatwork ironer. made use of THEMIS and GOES data to observe the magnetosphere boundary, the magnetopause. Wave-particle interactions in the solar wind in the turbulent region upstream from the bow shock act as a gate valve, changing the bow shock orientation and strength directly in front of Earth. The extreme bow shock variations cause undulations which launch pressure perturbations that may in turn energize particles in the Van Allen radiation belts. 

The THEMIS spacecraft continue to work at their original levels of operation and all the instruments function highly effectively. With their current positioning and the ability to work in conjunction with other nearby spacecraft, scientists look forward to the stream of data yet to come.I have tried several sets of torch light that have lasted one season only.