Space shuttle velocity
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Space Shuttle Velocity During Different Flight Phases
Space Shuttle Liftoff and Ascent Velocity
During the first two minutes after liftoff, the Space Shuttle's velocity increases rapidly as it ascends through the atmosphere. Simple physics models based on momentum conservation can be used to estimate the shuttle's speed during this phase, and these models have shown good agreement with actual telemetry data from shuttle launches such as Discovery and Endeavour in 2011. The shuttle's velocity increases steadily as it burns fuel and sheds weight, reaching several kilometers per second by the time the solid rocket boosters separate .
Orbital and Atmospheric Entry Velocities
Once in orbit, the Space Shuttle travels at a velocity of about 8 km/s (approximately 28,800 km/h or 17,500 mph). This high speed is necessary to maintain a stable low Earth orbit. During re-entry, the shuttle's guidance system manages its velocity as it descends through the atmosphere. The entry guidance system controls the shuttle from the point it first enters the atmosphere until its velocity drops to about 2,500 feet per second (roughly 0.76 km/s), at which point control is handed over to the terminal area energy management system. The shuttle's velocity is carefully managed using drag deceleration profiles to ensure a safe and accurate landing .
Shuttle Velocity and Plasma Phenomena
The shuttle's high orbital velocity (about 8 km/s) is significant in the context of plasma interactions in the upper atmosphere. Although this speed is below the critical ionization velocity for oxygen (12.7 km/s), certain conditions, such as the reflection of ambient ions, can create ion beams with velocities up to 16 km/s. These high velocities contribute to phenomena like the "shuttle glow," which is observed as a result of beam plasma discharge and critical ionization effects .
Shuttle Exhaust and Relative Velocities in the Ionosphere
During orbital maneuvers, the shuttle's engines expel exhaust gases at velocities between 4.7 and 10.7 km/s relative to the background atmosphere. These high-speed neutral gases interact with the ambient plasma, creating unique ion velocity distributions and chemical reactions in the ionosphere. The relative velocity between the shuttle exhaust and the surrounding ions is much higher than what occurs naturally in the ionosphere, leading to observable effects such as plasma turbulence and ionospheric disturbances .
Conclusion
The Space Shuttle's velocity varies significantly depending on its phase of flight: from rapid acceleration during liftoff, to extremely high speeds in orbit, and controlled deceleration during re-entry. These velocities are not only crucial for mission success and safety but also play a key role in the shuttle's interactions with the Earth's atmosphere and ionosphere, leading to unique physical and chemical phenomena Papadopoulos1984Harpold1982Kaplan2010+1 MORE.
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Accuracy of a 10 Hz GPS Unit in Measuring Shuttle Velocity Performed at Different Speeds and Distances (5 – 20 M)
The inaccuracy of a 10 Hz GPS unit in determining shuttle speed can be attributed to inaccuracy in determining shuttle distance.
On the shuttle glow (the plasma alternative)
The anomalous glow observed in recent space shuttle flights can be attributed to a combination of beam plasma discharge and critical ionization phenomena, with specular reflection of a small fraction of ambient ions forming an ion beam with velocity 16 km s-1.
Atmospheric guidance techniques and performance
The Space Shuttle entry guidance system successfully controls the orbiter from atmospheric penetration to Earth relative velocity of 2500 feet/second, demonstrating its stability and reliability during the first three missions.
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