TutiFruiti
Topic Author
Posts: 11
Joined: Sun Jan 06, 2019 3:23 pm

Shadow in rainbow hallow of A330

Sun Jan 06, 2019 3:33 pm

Hello All.
I want to understand the physics and meterology aspect behind the phenomenon. It shows an A330 landing at IST and when it descend into cloud cover it shows the airplane shadow, which is normal, but the important part is the shadow is surrounded by a rainbow shaped hallow. For first 10 seconds of video it is clear.


https://youtu.be/KxlQhi83PdA

Thankyou
 
alesfr
Posts: 17
Joined: Wed Mar 14, 2018 10:10 pm

Re: Shadow in rainbow hallow of A330

Sun Jan 06, 2019 4:10 pm

It's very common, I've seen it many times as pax, sometimes you can observe it for quite long periods of time when the aircraft flies not very high above the clouds

Wikipedia link below

https://en.wikipedia.org/wiki/Brocken_spectre
A318 A319 A320 A320N A321 A333 ATR72 BAE146 B735 B737 B738 B742 B753 B763 B772 B773 B789 CRJ200 CRJ700 CRJ1000 DASH8 ERJ135 ERJ145 E170 E190 F100 MD82 S2000
 
TutiFruiti
Topic Author
Posts: 11
Joined: Sun Jan 06, 2019 3:23 pm

Re: Shadow in rainbow hallow of A330

Sun Jan 06, 2019 4:55 pm

Thanks.. perfect answer.. got it
 
SAAFNAV
Posts: 535
Joined: Wed Mar 17, 2010 5:41 pm

Re: Shadow in rainbow hallow of A330

Mon Jan 07, 2019 12:06 pm

Also known as the guardian angel to flight crew
L-382 Loadmaster; ex C-130B Navigator
 
747Whale
Posts: 287
Joined: Fri Dec 07, 2018 7:41 pm

Re: Shadow in rainbow hallow of A330

Mon Jan 07, 2019 3:42 pm

The halo appearance is simply an effect of refraction; you could think of it as "bending" light. You can see some effects of refraction if you hold your hand against a bright light or bright sky; the fingers sometimes appear thinner than they are, and if you look at the the spaces between your fingers, you may see what look like lines paralleling your fingers; lines which aren't really there. This is refracted, or "bent" light, and can appear to concentrate around the shadow of an object if at the right focal length.

As others noted, it's quite common to see in the cloud and sometimes against the ground. It makes a pretty picture when flying directly into a cloud with the sun behind, sometimes seen in the cockpit and really hard to catch just at the right time to photograph.
 
TutiFruiti
Topic Author
Posts: 11
Joined: Sun Jan 06, 2019 3:23 pm

Re: Shadow in rainbow hallow of A330

Tue Jan 08, 2019 11:49 am

747Whale wrote:
The halo appearance is simply an effect of refraction; you could think of it as "bending" light. You can see some effects of refraction if you hold your hand against a bright light or bright sky; the fingers sometimes appear thinner than they are, and if you look at the the spaces between your fingers, you may see what look like lines paralleling your fingers; lines which aren't really there. This is refracted, or "bent" light, and can appear to concentrate around the shadow of an object if at the right focal length.

As others noted, it's quite common to see in the cloud and sometimes against the ground. It makes a pretty picture when flying directly into a cloud with the sun behind, sometimes seen in the cockpit and really hard to catch just at the right time to photograph.


Thats perfect explanation. To me it seems that phenomenon of diffraction as we studied in college back then. Diffration is refraction at edges . Yes. the window to capture this phenomenon will be short as it appears at entrance to clould cover and also depends on orientation with respect to sun..

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