SailNet Community - View Single Post - green flash
Thread: green flash
View Single Post
post #32 of Old 07-30-2011
Don Radcliffe
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
Originally Posted by CaptainForce View Post
People are less likely to see the green flash if:
1) they spend time looking at the sun before the last remnant remains.
2) the horizon is disturbed with larger waves.
3) they expect a moment of brighter light. (it's quick, not intense)
4) the air is humid or hazy or clouds are present.

The spectrum is produced at the limb of the earth in the same manner that white light is refracted in a simple cardboard slit spectroscope. There is no special inversion or reflection of the spectrum and it can be seen on land with the requisite flat horizon such as salt flats or a flat plain. If you consider the visible light as red-orange-yellow-green-blue-indigo-violet; the middle segment (yellow-green-blue) can be briefly distinguished as the "green flash". Of course, we all easily see the early diffused red & orange, so nobody exclaims this "flash" and thoretically one could see the indigo-violet flash, but this requires an even greater sensitivity. The green flash phenomenon is clear and simple optical physics and no mystery. Take care and joy, Aythya crew
If refraction is the answer, why are sunsets red? Think about it again.
donradclife is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome