- Recorder Online - http://www.berthoudrecorder.com -
Earthsky Tonight—May 7, See the legendary green flash
Posted By Gary Wamsley On May 6, 2010 @ 10:53 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
 Our image today was taken by Mike Baird . It is a classic image of a detached green flash, seen at sunset. Used with permission.
You can see green flashes with the eye, sometimes, if you are looking toward a very clear horizon. You must be looking just at sunset, at the last moment before the sun disappears below the horizon. In addition, you have to be careful not to look too soon. Wait until just the thinnest rim of the sun appears above the horizon. If you look too soon, the light of the sunset will dazzle (or damage) your eyes, and you will miss that day’s green flash.
There are many different types of green flash. Some describe a streak or ray  of the color green . . . like a green flame shooting up from the sunrise or sunset horizon. The most common green flash  which many people describe, is a flash of the color green seen when the sun is nearly entirely below the horizon.
You need a distant horizon to see any of these phenomena, and you need a distinct edge to the horizon. Therefore, these green flashes, streaks and rays are often seen over the ocean, but you can see them over land, too, if your horizon is far enough away. Pollution or haze on the horizon will hide this instantaneous flash of the color green.
Here is another good article about the green flash  by Peter Michaud.
Here is a rather subtle green flash video . I had to watch it several times to convince myself I saw any green.
Written by Deborah Byrd
CHANDRA Photo Album 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
Amazing Space 
Scope City 
Article printed from Recorder Online: http://www.berthoudrecorder.com
URL to article: http://www.berthoudrecorder.com/2010/05/06/earthsky-tonight%e2%80%94may-7-see-the-legendary-green-flash/
URLs in this post:
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/05/phase07.gif
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/05/greenflash_4301.jpg
 Mike Baird: http://www.flickr.com/photos/mikebaird/298481228/
 ray: http://mintaka.sdsu.edu/GF/observing/greenray.html
 green flash: http://mintaka.sdsu.edu/GF/
 Andrew Young’s green flash page: http://mintaka.sdsu.edu/GF/index.html
 picture of green flashes: http://mintaka.sdsu.edu/GF/pictures.html
 green flash: http://www.bishopmuseum.org/planetarium/greenflash.html
 green flash video: http://www.well.com/user/pk/waterfront/photo-of-the-week/GreenFlashVideo.avi
 Astronomy Picture of the Day from NASA/JPL: http://antwrp.gsfc.nasa.gov/apod/
 CHANDRA Photo Album: http://chandra.harvard.edu/photo/
 U.S. Naval Observator Astronomical Information cente: http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/astronomical-information-center
 StarDate Online: http://stardate.org/
 Sky and Telescope: http://www.skyandtelescope.com/observing/ataglance/
 National Geographic: http://news.nationalgeographic.com/news/
 Space Com: http://www.space.com/nightsky/
 Amazing Space: http://amazing-space.stsci.edu/tonights_sky/
 The York County Astronomical Society: http://www.ycas.org/tonights_sky.htm
 Scope City: http://www.scopecity.net/
Copyright © 2010 Berthoud Recorder. All rights reserved.