Not all clouds vex astronomers!

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adzel_3000

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Very cool images of Mother-of-Pearl Sky seen recently over Norway:<br /><br />http://www.aftenposten.no/spesial/bildeserier/article940373.ece<br /><br />These clouds are a located very high in the atmosphere. The clouds can be brighter than the full moon and are clearly visible at night or when the sun is low. These types of clouds are sometimes called polar stratospheric clouds. These clouds form and disappear rapidly in extremely cold (but stable) air. The recipe is basically water condensing at high altitude while in the presence of some chemicals or pollutants. <br /><br />--A3K
 
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vogon13

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Are you sure that's not Emperor Ming's lightning shield?<br /><br />Just kidding, what an eerily beautiful scene, nothing like that ever happens here, even the aurora doesn't look that good. <div class="Discussion_UserSignature"> <p><font color="#ff0000"><strong>TPTB went to Dallas and all I got was Plucked !!</strong></font></p><p><font color="#339966"><strong>So many people, so few recipes !!</strong></font></p><p><font color="#0000ff"><strong>Let's clean up this stinkhole !!</strong></font> </p> </div>
 
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Saiph

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sweet picture. <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector.  Goes "bing" when there's stuff.  It also fries eggs at 30 paces, wether you want it to or not actually.  I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>
 
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odysseus145

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Are those similar to noctilucent clouds? <div class="Discussion_UserSignature"> </div>
 
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newtonian

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adzel - Thank you. <br /><br />Note also a link to a beautiful Noctilucent display on a link in my thread on why Noctilucent clouds are on the increase.
 
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