Abstract
Sprites and halos are two types of the so-called transient luminous events occurring in the upper layers (40–90 km) of the earth atmosphere. Their spectacular appearance is due to the optical emissions from mesospheric plasmas caused by the electric breakdown of the high-altitude rarified air. While halos look like flattened diffuse flashes of light appearing between 80 and 85 km, sprites exhibit a sharp transition between the upper diffuse and lower plasma streamer regions, as observed in one of the images shown here.
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