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Post Info TOPIC: THEMIS spacecrafts
Blobrana


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ARTEMIS P1 Spacecraft
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First ARTEMIS Spacecraft Successfully Enters Lunar Orbit

The first of two ARTEMIS ("Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's Interaction with the Sun") spacecraft is now in its lunar orbit.
On June 22, ARTEMIS P1 began firing its thrusters to move out of its kidney-shaped "libration" orbit on one side of the moon, where it has been since January. Three successive manoeuvres were used to kick the spacecraft out of its orbit and send it on a trajectory toward the moon.
It continued on that path until June 27 at 10:04 a.m. EDT when the spacecraft was about 2,400 miles from the moon. At that point, flight engineers at UC Berkeley issued the first commands to move it into orbit around the moon. Two more manoeuvres helped fine-tune the position, and as of 12:30 p.m. EDT, ARTEMIS P1 is now in lunar orbit.
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Blobrana


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RE: THEMIS spacecrafts
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Tracking the Origins of Speedy Space Particles

NASA's Time History of Events and Macroscale Interaction during Substorms (THEMIS) spacecraft combined with computer models have helped track the origin of the energetic particles in Earth's magnetic atmosphere that appear during a kind of space weather called a substorm. Understanding the source of such particles and how they are shuttled through Earth's atmosphere is crucial to better understanding the Sun's complex space weather system and thus protect satellites or even humans in space.
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Blobrana


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A pair of NASA spacecraft that were supposed to be dead a year ago are instead flying to the Moon for a breakthrough mission in lunar orbit.
The story begins in 2007 when NASA launched a fleet of five spacecraft into Earth's magnetosphere to study the physics of geomagnetic storms. Collectively, they were called THEMIS, short for "Time History of Events and Macroscale Interactions during Substorms." P1 and P2 were the outermost members of the quintet.
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Blobrana


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THEMIS-B spacecraft
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ARTEMIS Spacecraft Believed Stuck by Object

Flight Dynamics data from THEMIS-B (one of the two ARTEMIS spacecraft) indicated that one of the EFI (electric field instrument)spherical tip masses may have been struck by a meteoroid at 0605 UT on October 14. All science instruments continue to collect data. The probe and science instruments aboard the spacecraft continue to operate nominally. The upcoming insertion into Lissajous orbit will not be interrupted.
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Blobrana


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ARTEMIS
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A pair of NASA science satellites that have been studying how solar geomagnetic storms impact Earth are being dispatched to the moon for a new mission.
The probes are part of a constellation of five satellites collectively known as THEMIS, an acronym for Time History of Events and Macroscale Interactions during Substorms, which was launched in February 2007.
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Blobrana


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RE: THEMIS spacecrafts
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NASA Themis Delta II Rocket - Launch Animation



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Blobrana


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A few times a day, a gigantic explosion shakes the Earth's magnetic shield, triggering a chain of events that lights up the polar skies with dazzling auroras. These explosions are substorms, and how they happen has long been a mystery. Until now, no one has been able to explain how they gather the energy to create such spectacular displays, or what happens to trigger them.
Now a flotilla of NASA satellites is finally providing answers.

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Blobrana


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Imagine living on a planet where Northern Lights fill the heavens at all hours of the day. Around the clock, even in broad daylight, luminous curtains shimmer and ripple across the sky, mesmerising anyone who bothers to look.
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Blobrana


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Five U.S. space agency satellites launched last February to investigate magnetic storms around Earth will move into prime observing position next month.
The satellites have already observed the dynamics of a rapidly developing magnetic substorm, confirmed the existence of giant magnetic "ropes" and observed small explosions in the outskirts of Earth's magnetic field.

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Blobrana


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NASA's fleet of THEMIS spacecraft, launched less than 8 months ago, has made three important discoveries about spectacular eruptions of Northern Lights called "substorms" and the source of their power. The discoveries include giant magnetic ropes that connect Earth's upper atmosphere to the Sun and explosions in the outskirts of Earth's magnetic field.

"The mission is only beginning but THEMIS is already surprising us" - Vassilis Angelopoulos the mission's principal investigator at the University of California, Los Angeles.

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