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http://news.nationalgeographic.com/news/2003/06/0625_030625_atmospherethunder.html
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A rare transient luminous event is a type of atmospheric phenomenon that occurs in the upper atmosphere, above thunderstorms. It is characterized by brief flashes of light, such as red sprites, blue jets, and elves.
Rare transient luminous events are usually photographed using specialized equipment, such as high-speed cameras or low-light cameras. These cameras are set up on the ground and pointed towards the sky in areas where TLEs are known to occur.
The exact cause of rare transient luminous events is still not fully understood. However, it is believed that they are triggered by the electrical activity in thunderstorms below. The lightning and other electrical discharges create disturbances in the Earth's magnetic field, which can lead to the formation of TLEs.
No, rare transient luminous events are not dangerous for humans. They occur at very high altitudes and are not associated with any direct threat to people on the ground. However, they can be a sign of severe weather conditions, such as strong thunderstorms, which can be dangerous.
As the name suggests, rare transient luminous events are not very common. They are difficult to observe and can only be seen under specific conditions. However, with the advancement of technology and the increase in storm-chasing activities, more and more of these events are being captured and studied.