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stereo (adj.)
1.designating sound transmission from two sources through two channels
stereo (n.)
1.reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound
2.two photographs taken from slightly different angles that appear three-dimensional when viewed together
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Merriam Webster
Stereo-Ste"re*o- (?). [Gr. stereo`s solid. See Stare to gaze.] A combining form meaning solid, hard, firm, as in stereo-chemistry, stereography.
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⇨ definição - Wikipedia
stereo (adj.)
stereo (n.)
audio equipment, sound system, stereo equipment, stereo hi-fi, stereophonic system, stereophony, stereoscopic photograph, stereoscopic picture, stereo system, music center (American), music centre (British)
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stereo (adj.)
⇨ 390° of Simulated Stereo • 3D Stereo View • 94.7 Highveld Stereo • AM stereo • AM-Stereo • Adventures in Stereo • Air Stereo • Apples in Stereo • Bobby Digital in Stereo • Bose stereo speakers • Brand New (The Stereo Bus album) • Bring Your Own Stereo • Car Stereo Wars • Christmas in Stereo • Coma stereo • Computer stereo vision • Connected (Stereo MCs album) • Connected (Stereo MCs song) • Crime in Stereo • Crime in Stereo Is Dead • Death by Stereo • Death by Stereo/Ensign • Dipole stereo • Discotheque (Stereo Total album) • Dolby Stereo • Dolby Stereo SR • Extinction in Stereo • Eyepieceless stereo microscope • FM Stereo Johor Bahru • From the Screen to Your Stereo • From the Screen to Your Stereo Part II • Heartbreak in Stereo • Heavy Stereo • Here We Go, Stereo • Humming Urban Stereo • In Car Stereo • In Stereo • Intensity stereo • JPEG Stereo • Joint Stereo • Kodak Stereo Camera • Let's Go! (The Apples in Stereo EP) • Life By Stereo • Live in Chicago (The Apples in Stereo album) • Mono Vs Stereo • Monoloog in Stereo • Moving in Stereo • Moving on Stereo • Muntz Stereo-Pak • My Melody (Stereo Total album) • NOS stereo technique • Nicam Digital Stereo • Nostalgia In Stereo • ORTF stereo technique • Official National Lampoon Stereo Test and Demonstration Record • Oh No Not Stereo • Open Air Stereo • PNG Stereo • Parametric Stereo • Personal Stereo • Personal stereo • Phase 4 Stereo • Photometric Stereo • Portable stereo • Pumping on Your Stereo • Purple Stereo Countdown • Sgt. Shonen's Exploding Plastic Eastman Band Request Mono! Stereo • Shelf stereo • Soda Stereo • Soda Stereo (album) • Soda Stéreo • Sold Out (In Stereo) • Spike Jones in Stereo • Static in Stereo • Stereo (Christie Front Drive) • Stereo (John Legend song) • Stereo (Paul Westerberg album) • Stereo (album) • Stereo (disambiguation) • Stereo (film) • Stereo (movie) • Stereo (song) • Stereo * Type A • Stereo 360 • Stereo 3d • Stereo 974 • Stereo Concert • Stereo FM • Stereo Fuse • Stereo Fuse (album) • Stereo Hits • Stereo Love • Stereo MC's • Stereo MCs • Stereo Mike • Stereo Nova • Stereo Realist • Stereo Review • Stereo Rodeo • Stereo Sound Agency • Stereo Total • Stereo Type • Stereo Type A • Stereo World • Stereo camera • Stereo console • Stereo dipole • Stereo generator • Stereo glasses • Stereo imaging • Stereo microscope • Stereo nightclub • Stereo reciever • Stereo skyline • Stereo-Pak • Stereo-Types • Stereo-blind • Stereo-blindness • Strange in Stereo • Sueño Stereo • Supernatural (Stereo MCs album) • The Apples in Stereo • The Apples in Stereo discography • The Beatles Stereo Box Set • The Low Frequency in Stereo • The Olivia Tremor Control/The Apples in Stereo • The Stereo • The Stereo Bus • The Stereo Bus (album) • The Stereo Flys • The Stereo Record Guide • Too Much Stereo • Tributo a Soda Stereo • Ultra Stereo • View-Master Personal Stereo Camera
Wikipedia - ver também
Wikipedia
One of two STEREO spacecraft |
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Operator | NASA |
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Major contractors | Johns Hopkins University Applied Physics Laboratory |
Mission type | Orbiter |
Satellite of | Sun |
Launch date | 2006-10-26, 00:52:00 UTC |
Carrier rocket | Delta II 7925-10L |
Launch site | Space Launch Complex 17-B Cape Canaveral Air Force Station |
Mission duration | >3 years 5 years, 9 months and 17 days |
COSPAR ID | 2006-047 |
Homepage | http://stereo.jhuapl.edu/ |
Mass | 620 kg |
Power | 475.0 W |
Orbital elements | |
Orbital period | STEREO A: 346 days STEREO B: 388 days |
Instruments | |
Main instruments |
Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI):
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STEREO (Solar TErrestrial RElations Observatory) is a solar observation mission.[1] Two nearly identical spacecraft were launched into orbits around the sun that cause them to respectively pull farther ahead of and fall gradually behind the Earth. This will enable stereoscopic imaging of the Sun and solar phenomena, such as coronal mass ejections.
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This section includes a list of references, but its sources remain unclear because it has insufficient inline citations. (February 2011) |
The two STEREO spacecraft were launched at 0052 UTC on October 26, 2006 from Launch Pad 17B at the Cape Canaveral Air Force Station in Florida on a Delta II 7925-10L launcher into highly elliptical geocentric orbits. The apogee reached the Moon's orbit. On December 15, 2006, on the fifth orbit, the pair swung by the Moon for a gravitational slingshot. Because the two spacecraft were in slightly different orbits, the "ahead" (A) spacecraft was ejected to a heliocentric orbit inside Earth's orbit while the "behind" (B) spacecraft remained temporarily in a high earth orbit. The B spacecraft encountered the Moon again on the same orbital revolution on January 21, 2007, ejecting itself from earth orbit in the opposite direction from spacecraft A. Spacecraft B entered a heliocentric orbit outside the Earth's orbit. Spacecraft A will take 347 days to complete one revolution of the sun and Spacecraft B will take 387 days. The A spacecraft/sun/earth angle will increase at 21.650 degree/year. The B spacecraft/sun/earth angle will change −21.999 degrees per year. Their current locations are shown here.
Over time, the STEREO spacecraft will continue to separate from each other at a combined rate of approximately 44 degrees per year. There are no final positions for the spacecraft. They achieved 90 degrees separation on January 24, 2009, a condition known as quadrature. This is of interest because the mass ejections seen from the side on the limb by one spacecraft can potentially be observed by the in situ particle experiments of the other spacecraft. As they passed through Earth's Lagrangian points L4 and L5, in late 2009, they searched for Lagrangian (trojan) asteroids. On February 6, 2011, the two spacecraft were exactly 180 degrees apart from each other, allowing the entire Sun to be seen at once for the first time.[2]
Even as the angle increases, the addition of an Earth-based view, e.g. from the Solar Dynamics Observatory, will still provide full-Sun observations for several years. In 2015, contact will be lost for several months when the STEREO spacecraft pass behind the Sun.
They will then start to approach Earth again, with closest approach sometime in 2023. They will not be recaptured into Earth orbit.
The principal benefit of the mission is stereoscopic images of the sun. In other words, because the satellites are at different points along the Earth's orbit from the Earth itself, they can photograph parts of the sun that are not visible from the Earth. This permits NASA scientists to directly monitor the far side of the sun, instead of inferring the activity on the far side from data that can be gleaned from Earth's view of the sun. The STEREO satellites principally monitor the far side for coronal mass ejections—massive bursts of solar wind, solar plasma, and magnetic fields that are sometimes ejected into space.[3]
Since the radiation from coronal mass ejections, or CMEs, can disrupt Earth's communications, airlines, power grids, and satellites, more accurate forecasting of CMEs has the potential to provide greater warning to operators of these services.[3] Before STEREO, the development of the sunspots that are associated with CMEs on the far side of the sun was only possible using helioseismology, which only provides low-resolution maps of the activity on the far side of the Sun. Since the sun rotates every 25 days, detail on the far side was invisible to Earth for days at a time before STEREO. The period that the sun's far side was previously invisible was a principal reason for the STEREO mission.[4]
STEREO program scientist Lika Guhathakurta expects "great advances" in theoretical solar physics and space weather forecasting with the advent of constant 360-degree views of the sun.[5] STEREO's observations are already being incorporated into forecasts of solar activity for airlines, power companies, satellite operators, and others.[6]
STEREO has also been used to discover 122 eclipsing binaries and study hundreds more variable stars.[7] STEREO can look at the same star for up to 20 days.[7]
Each of the spacecraft carries cameras, particle experiments and radio detectors in four instrument packages:
This section requires expansion. (June 2008) |
Almost the entire surface of the Sun, as seen by the STEREO satellites on 10 February 2011. The image was taken in Extreme Ultraviolet light at 19.5 nm, and the white lines show solar coordinates (0 degrees is directly towards the Earth).
A lunar transit of the sun captured during calibration of Stereo B's Ultra Violet imaging cameras. The Moon appears much smaller than it does seen from Earth, because the spacecraft-Moon separation was several times greater than the Earth-Moon distance.
The STEREO Space Probes in a Goddard Space Flight Center Cleanroom
The Moon passing in front of the Sun from STEREO-B, February 25, 2007 (See the movie of the transit)
A three-dimensional anaglyph taken by STEREO, released by NASA on April 23, 2007. 3D red cyan glasses are recommended to view this image correctly.
A three-dimensional time-for-space wiggle image taken by STEREO
Jupiter as seen by the STEREO-A HI1 on 2008 November 23.
Wikimedia Commons has media related to: STEREO (spacecraft) |
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