Onweer/Sprite Documentaire

[Oxize]

Aangezien het onweerseizoen binnenkort alweer van start gaat, wil ik jullie deze documentaire niet onthouden. Zag deze toevallig laatst op Youtube voorbijkomen, en was zeer indrukwekkend om te kijken.

Sprites are large electrical discharges that take place high over thunderstorm clouds, or cumulonimbus, triggering a rather different range of visual forms flickering in the evening sky. They are activated by the discharges of favorable lightning between an underlying thundercloud and also the ground.

Sprites look like luminous reddish-orange flashes. They frequently happen in collections within the elevation variety 50-- 90 kilometres (31-- 56 mi) over the Planet's surface area. Erratic visual records of sprites go back at least to 1886, yet they were first photographed on July 6, 1989 by researchers from the University of Minnesota as well as have actually consequently been caught in video clip recordings numerous thousands of times.

Sprites are in some cases wrongly called upper-atmospheric lightning. However, sprites are cold plasma phenomena that lack the warm channel temperatures of tropospheric lightning, so they are more comparable to fluorescent tube discharges than to lightning discharges.

Sprites are tinted reddish-orange [2] in their upper areas, with bluish dangling tendrils below, and also can be come before by a reddish halo. They last much longer than normal lower dizzying discharges, which last commonly a few short nanoseconds, as well as are set off by the discharges of positive lightning between the thundercloud and the ground. [7] They commonly occur in collections of two or even more, and also generally span the elevation array 50 to 90 kilometres (31 to 56 mi), with what appear to be tendrils hanging here, and branches reaching over.

Optical imaging utilizing a 10,000 frame-per-second high speed electronic camera reveals that sprites are really clusters of little, decameter-sized (10-- 100 m or 33-- 328 ft) spheres of ionization that are launched at an elevation of regarding 80 km (50 mi) and afterwards move downward at rates of as much as ten percent the speed of light, complied with a few nanoseconds later by a different collection of higher relocating rounds of ionization. [8] Sprites may be flat displaced by as much as 50 km (31 mi) from the location of the underlying lightning strike, with a dead time adhering to the lightning that is commonly a few short milliseconds, however on rare events might depend on 100 milliseconds.

[alfons]

wat een geweldige documentaire , dank hiervoor

[Oxize]

Weer een intressante Documentaire gevonden. Zeer indrukwekkend. Lijkt me best wel een keer gaaf om naar Afrika te gaan om daar onweer te bestuderen/fotograferen.

Discovery Channel - Raging Planet: Lightning VO