green flash - Page 4 - SailNet Community
Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.

Reply
 
LinkBack Thread Tools
post #31 of 46 Old 07-26-2011
Senior Member
 
CaptainForce's Avatar
 
Join Date: Jan 2006
Location: living aboard since 1972
Posts: 1,715
Thanks: 0
Thanked 12 Times in 12 Posts
Rep Power: 10
 
Quote:
Originally Posted by casey1999 View Post
I have never seen the green flash on a sun rise...........
I'm not surprised. It's very difficult to be looking at the horizon for the sunrise at the moment of rise and at the exact position. Take care and joy, Aythya crew
CaptainForce is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #32 of 46 Old 07-30-2011
Don Radcliffe
 
Join Date: May 2007
Location: Santa Cruz
Posts: 396
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Quote:
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 Quick Reply Share with Facebook
post #33 of 46 Old 07-30-2011
Member
 
Greenflash35's Avatar
 
Join Date: Nov 2008
Posts: 60
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
GreenFlash is in a dry yard untill the splash of Dec 2011.

GreenFlash35
Greenflash35 is offline  
Quote Quick Reply Share with Facebook
post #34 of 46 Old 07-30-2011
Dragon Mod
 
DRFerron's Avatar
 
Join Date: Nov 2005
Location: SE Pennsylvania
Posts: 4,649
Thanks: 106
Thanked 199 Times in 182 Posts
Rep Power: 10
 
Dock
Quote:
Originally Posted by pdqaltair View Post
I'm stunned by the widespread phenomenon of computers on which the Google search feature is be disabled. I wonder if Google knows?
A new forum member reopened a thread begun in 2001. I don't think Google existed back then.

Donna


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Catalina 30 TRBS
DRFerron is online now  
Quote Quick Reply Share with Facebook
post #35 of 46 Old 07-30-2011
Senior Member
 
CaptainForce's Avatar
 
Join Date: Jan 2006
Location: living aboard since 1972
Posts: 1,715
Thanks: 0
Thanked 12 Times in 12 Posts
Rep Power: 10
 
Quote:
Originally Posted by donradclife View Post
If refraction is the answer, why are sunsets red? Think about it again.
This is much the same as asking why is the sky blue. It's not a matter of refraction, but the selective scattering of light waves by the nature of what the white light is passing through. The composition of the atmosphere contains the molecules with chemical bonds that scatter the blue light and this is apparent. The red light seen before and during the first of sunset is affected by the far thicker and different atmosphere across the surface of the earth at that angle of incidence. Refraction does occur and the spectrum is momentarily evident as the last of the light passes the limb of the earth, but this phenomenon is not related to the earlier seen red color or the even still earlier blue color.
CaptainForce is offline  
Quote Quick Reply Share with Facebook
post #36 of 46 Old 07-30-2011
Senior Member
 
billyruffn's Avatar
 
Join Date: Sep 2004
Location: Massachusetts
Posts: 1,292
Thanks: 5
Thanked 28 Times in 19 Posts
Rep Power: 11
 
Wink Green wink

Green flash is a misnomer. It’s more of a green “wink” -- hard to see unless you’re watching closely. Blink at the wrong moment and you’ll miss it. For a really good sense of how it forms look at the sun through binoculars -- BUT NOT UNTIL the sun is 80-90% below the horizon. What you see is a green edge form first at the sides of the sun and then work it’s way across the bottom and then across the top edge. The middle of the sun (what remains of it) will be orange/yellow surrounded by the flickering green edge. As the sun dips below the horizon the green edges collapse on themselves and in the last instant it “winks” all green.

I always thought it was an urban, no maritime myth -- but it’s real and has nothing to do with the rum you may be drinking at the time.
billyruffn is offline  
Quote Quick Reply Share with Facebook
post #37 of 46 Old 07-31-2011
Junior Member
 
Join Date: May 2011
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I have never had the opportunity to see it. It seems that it is a rare experience. I don't think there is any reason to worry.
Boatinglifeaway is offline  
Quote Quick Reply Share with Facebook
post #38 of 46 Old 08-03-2011
Senior Member
 
St Anna's Avatar
 
Join Date: Mar 2003
Location: Southern QLD, Bayside
Posts: 1,428
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 13
 
Quote:
Originally Posted by billyruffn View Post
Green flash is a misnomer. It’s more of a green “wink” -- hard to see unless you’re watching closely. Blink at the wrong moment and you’ll miss it. For a really good sense of how it forms look at the sun through binoculars -- BUT NOT UNTIL the sun is 80-90% below the horizon. What you see is a green edge form first at the sides of the sun and then work it’s way across the bottom and then across the top edge. The middle of the sun (what remains of it) will be orange/yellow surrounded by the flickering green edge. As the sun dips below the horizon the green edges collapse on themselves and in the last instant it “winks” all green.

I always thought it was an urban, no maritime myth -- but it’s real and has nothing to do with the rum you may be drinking at the time.
Absolutely true.

You can only see it in certain locations, in my experience, in the tropics and only when the sun sets over a very long fetch of water (a sea or an ocean)

I also think it is not believed untill seen, then you want to see another one!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
St Anna is offline  
Quote Quick Reply Share with Facebook
post #39 of 46 Old 08-04-2011
Senior Member
 
Omatako's Avatar
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,537
Thanks: 1
Thanked 32 Times in 29 Posts
Rep Power: 12
 
Quote:
Originally Posted by Boatinglifeaway View Post
I have never had the opportunity to see it. It seems that it is a rare experience.
Apparently not

Quote:
Originally Posted by casey1999 View Post
I have never seen the green flash on a sun rise but have seen hundreds on a sunset
I have sailed across oceans for three decades and I've seen it once. I feel positively deprived.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

__________________

"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."

Arthur C. Clarke
Omatako is offline  
Quote Quick Reply Share with Facebook
post #40 of 46 Old 08-09-2011
Junior Member
 
Join Date: Aug 2011
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Unhappy Link no good

This link to "green flash" is no longer valid.

http://www.geocities.com/buccaneersa...reperfect.html
lmmohr is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Marinette to Fayette in Green Bay john_r Chartering 1 06-10-2003 04:30 AM
Green sailor needs advise on docking, an anchor......... sailingsundance Cruising & Liveaboard Forum 2 05-21-2003 11:15 AM
Green Water Cruising dtfm Cruising & Liveaboard Forum 3 09-25-2002 10:49 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome