The Green Lights of Guatemala seen from Space

AI Thread Summary
The discussion centers on the unusual green lights of Guatemala as seen from the International Space Station (ISS) flyover video. Observers noted that the entire country appears green, contrasting with the bright orange lights of the nearby Mexican city of Tapachula and the capital of Guatemala, which is the only area with orange lighting. Speculation suggests that Guatemala may use a different type of lighting, possibly LED, or have regulations influencing illumination types. Some participants referenced a project aimed at improving lighting in rural areas, although its impact seems limited. The mystery of Guatemala's lighting remains unresolved, prompting further inquiry into national regulations or programs.
Kabbotta
Messages
45
Reaction score
0
If any group of people can help me with this interesting one it's you folks. So I hope most of you have seen that wonderful video of the ISS flyover of the Earth. In case you haven't for reference...



Other than being blown away like everyone else something particular caught my eye, and after searching the web I found a list of the countries and discovered the interesting area was the country of Guatemala. If you watch closely around 1:26 when they fly over Guatemala the lights of the entire country appear green. You can almost trace the countries borders by following the green tinted area. This is most noticeable on the border with the very southern tip of Mexico where you can clearly see the bright orange city of Tapachula and the sliver of Mexico that extends the farthest south with this city included is clearly bright orange like the rest of the world from the video. To make it a little more intriguing it appears that the capital city of Guatemala is the ONLY part of the country that has bright orange lights like the rest of the world.

Any insights would be helpful. Obviously, my first assumption was Guatemala uses a different kind of city light than...uhh, the rest of the world? Maybe Mercury or something, but no searches online appeared to confirm anything like that, and why the capital city wasn't converted when the rest of the country was makes it even a little stranger. Thanks a lot for any help.
 
Last edited by a moderator:
Science news on Phys.org
cant answer the reason for the green lighting just in that country strange huh

but it was cool seeing the red and green aurora and all the lightning from thunderstorms
would be nice to watch at a slower speed so we were able to take in where the ISS was flying over at times and more general detail.

thanks for the link
Dave
 
Hey sir, that was the first thing I thought too. Here's the list I found...

The list:
1. United States
2. Eastern United States
3. Madagascar to southwest of Australia
4. South of Australia
5. Northwest coast of United States to Central South America
6. Southern to the Northern Pacific Ocean
7. Halfway around the World
8. Central Africa and the Middle East
9. Sahara Desert and the Middle East
10. Canada and Central United States
11. Southern California to Hudson Bay
12. Islands in the Philippine Sea
13. Eastern Asia to Philippine Sea and Guam
14. Middle East
15. Mediterranean Sea
16. United States
17. Indian Ocean
18. Eastern Europe to Southeastern Asia
 
First of all: many thanks for this great video!

In regard to the question I can only speculate: Is it possible that Guatemala has a regulation or program to support a special kind of illumination, e.g. LED lighting?

Edit: How about his: http://lightthevillage.com/project.html
 
Last edited by a moderator:
DrStupid said:
First of all: many thanks for this great video!

In regard to the question I can only speculate: Is it possible that Guatemala has a regulation or program to support a special kind of illumination, e.g. LED lighting?

Edit: How about his: http://lightthevillage.com/project.html

I assume it's something like that. Thanks for your link, because I wasn't able to find ANYTHING, but by the website's own admission they have only been able to help a handful of villages so far and from the video you can see that even large cities like Quetzaltenango are bright green. The mystery continues ; )
 
Last edited by a moderator:
Kabbotta said:
but by the website's own admission they have only been able to help a handful of villages so far

Of course this special project is not sufficient but maybe the idea to use LEDs is enforced by a national law. This would not be unique. According to an EU Directive all filament lamps will be stepwise removed from the European market. By this September all filament lamps with 25 W ore more will be prohibited by law. The replacement by fluorescent lamps or LEDs will lead to a conversion of the European light emission that might be observed from space. Maybe there is a similar regulation in Guatemala. Unfortunately I am not familiar with their national law.
 
Thread 'A quartet of epi-illumination methods'
Well, it took almost 20 years (!!!), but I finally obtained a set of epi-phase microscope objectives (Zeiss). The principles of epi-phase contrast is nearly identical to transillumination phase contrast, but the phase ring is a 1/8 wave retarder rather than a 1/4 wave retarder (because with epi-illumination, the light passes through the ring twice). This method was popular only for a very short period of time before epi-DIC (differential interference contrast) became widely available. So...
I am currently undertaking a research internship where I am modelling the heating of silicon wafers with a 515 nm femtosecond laser. In order to increase the absorption of the laser into the oxide layer on top of the wafer it was suggested we use gold nanoparticles. I was tasked with modelling the optical properties of a 5nm gold nanoparticle, in particular the absorption cross section, using COMSOL Multiphysics. My model seems to be getting correct values for the absorption coefficient and...
After my surgery this year, gas remained in my eye for a while. The light air bubbles appeared to sink to the bottom, and I realized that the brain was processing the information to invert the up/down/left/right image transferred to the retina. I have a question about optics and ophthalmology. Does the inversion of the image transferred to the retina depend on the position of the intraocular focal point of the lens of the eye? For example, in people with farsightedness, the focal point is...
Back
Top