noctilucent clouds

Strange, Glowing Night Clouds Continue to Spread

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Submitted by Desert Gypsy on

Wired.com-6/13/13, Joe Hanson

 

Just after summer sunsets in northern latitudes, shimmering, wispy clouds appear in the twilight sky. This year, these noctilucent clouds have appeared earlier and farther south than ever before.

Noctilucent clouds exist higher in Earth’s atmosphere than any other cloud type. First observed in 1885 following the eruption of Krakatoa, they were a sight reserved for Earth’s northernmost residents. In recent years, however, their intensity and frequency have increased, often at latitudes previously thought to be too far south for noctilucent clouds to form.

 

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NOCTILUCENT CLOUD SEASON BEGINS

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Submitted by Desert Gypsy on

Spaceweather.com- 5/27/13

 

Over the weekend, sky watchers in northern Europe and Canada spotted electric-blue tendrils of light reaching out of the western sky at sunset. This signals the beginning of the 2013 season for noctilucent clouds (NLCs). Photographer Silvar Mehik sends this picture from the island of Saaremaa in Estonia:

 

 

NLCs are Earth's highest clouds. In the upper atmosphere, 80+ km high, tiny ice crystals nucleate around meteoroids and other aerosols. When the crystals catch the rays of the setting sun, they glow electric blue. For reasons that are not fully understood, these highest and coldest of clouds form during the warmest months on the ground--late spring and summer.

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