Picture of the Day

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[Marshmallow]

.........

 

[Armstrong]

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Marsha stop hugging the cat....its not a toy...its a living thing - you'd suffocate it !

 

[Marshmallow]

Marsha stop hugging the cat....its not a toy...its a living thing - you'd suffocate it !

 

[HRK]

 

[Alpha1]

 

[Alpha1]

 

[mughaljee]

جمعۃ مبارک ۔۔ !

 

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[Al Bhatti]

 

[dexter]

 

[HRK]

Not only this there are reports that Israel used CW in Lebanon War, US used CW in Fallujah during second Iraq War....

 

[HRK]

Twilight phenomena

Twilight phenomenon is produced when unburned particles of missile or rocket propellant and water left in the vapor trail of a launch vehicle condenses, freezes and then expands in the less dense upper atmosphere. The exhaust plume, which is suspended against a dark sky is then illuminated by reflective high altitude sunlight, which produces a spectacular, colorful effect when seen at ground level. The phenomenon typically occurs with launches that take place either 30 to 60 minutes before sunrise or after sunset when a booster rocket or missile rises out of the darkness and into a sunlit area, relative to an observer’s perspective on the ground.

This phenomenon usually produces a cloud of green, blue, white and rose colored hues which takes on a corkscrew appearance as it is whipped around by wind currents. It is seen within two to three minutes after a launch has occurred. Depending on weather conditions, it could remain in the sky for up to half an hour before dispersing.

Pre-dawn launches are probably less spectacular than their dusk counterparts. During dusk launches, the sunlight shines through the exhaust plume. Pre-dawn launches, on the other hand, produce a more subtle display because the sunlight directly reflects off the plume.

StarStuff

 

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