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	Pink Auroras

mariana3

4-14-2008 6:27 PM

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tags:

auroras, astronomy, earth, science

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/c987e51b-7447-4488-b1b4-3c6f35baca1d/167E74FF-4173-4938-87F5-655CEF8F51C0/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.spaceweather.com/" href="http://www.spaceweather.com/" style="font-size: 11px;">www.spaceweather.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.spaceweather.com/"><FONT size="3"><STRONG><FONT color="#ff0000">PINK AURORAS:</FONT></STRONG></FONT> 
              "Working at a remote mine in Canada's Northwest Territorry 
              allows us to see auroras regularly," says Lana Rupp, "but 
              April 6th was the first time I've seen so many colors--pink, purple 
              and green." She took this picture of the sky above the mine 
              using her <A href="http://www.spaceweather.com/xtra/results_nikon.php?searchTerm=nikon%20d40x">Nikon 
              D40X</A>:</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.spaceweather.com/"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.spaceweather.com/img/1C409F58-A14B-4B37-911C-DFED25CE7AA9" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.spaceweather.com/">Why the pink? Auroras are caused by charged particles 
              (mainly electrons) from space raining down on Earth's atmosphere, 
              causing the air to glow where they hit. The most common shade is 
              green; this is the color given off by oxygen 60+ miles above Earth's 
              surface. On April 6th, however, a burst of extra-energetic electrons 
              penetrated the atmosphere deeper than usual reaching altitudes less 
              than 60 miles. For such "low auroras," the temperature 
              and density of air favor not the green glow of oxygen but the pink 
              and purple shades of molecular nitrogen, hence the pink fringe. 
              <A href="http://odin.gi.alaska.edu/FAQ/#color">Learn more</A> about 
              aurora colors from Alaska's Geophysical Inststitute.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/167E74FF-4173-4938-87F5-655CEF8F51C0/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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