by Ann » Tue Oct 16, 2018 7:01 am
geckzilla wrote: ↑Tue Oct 16, 2018 6:30 am
Ann wrote: ↑Tue Oct 16, 2018 5:39 amAnd how can we tell the difference between ultraviolet-bright objects and infrared-bright objects in this map? What do the colors mean?
The pinkish areas are reflecting blue light more, and near-uv light a bit less. The bluest areas are reflecting the near-uv wavelengths at ~225nm the most. Cyan areas reflect a broader range of near-uv light from ~275-225nm. Whiteish areas reflect the wavelengths more evenly. The poles don't seem to reflect much near-uv light at all, while the equatorial regions show a lot of scattering of the shorter wavelengths. So the colors are just showing what wavelengths are being absorbed, reflected, and possibly emitted, though I don't suspect much, if any, emission is seen here.
Can I write a more generic description of color? Sheesh. Sorry I don't know more. Probably would need to study atmospheric physics and chemistry to be of any use.
Geck, I really hope I don't say anything offensive here, but in my opinion blue objects look blue either because they specifically reflect blue (or green to ultraviolet) light more than they reflect yellow to red light, or else they look blue because they emit blue light. That's why I find pink a weird color to represent ultraviolet light. But mapped color is mapped color, so really pink is just a good as any other color here.
Then again, you just explained to me that blue objects that don't emit much ultraviolet light can be considered "red from an ultraviolet point of view". I can understand that, of course. That still doesn't explain the pink color of the most ultraviolet objects on Jupiter. Perhaps the color was chosen arbitrarily.
My main complaint is that today's caption doesn't explain what the different colors mean. Thanks for telling me about it, I really appreciate it, but I would prefer that the caption told me.
Ann
[quote=geckzilla post_id=286570 time=1539671425 user_id=124138]
[quote=Ann post_id=286569 time=1539668394 user_id=129702]And how can we tell the difference between ultraviolet-bright objects and infrared-bright objects in this map? What do the colors mean?
[/quote]
The pinkish areas are reflecting blue light more, and near-uv light a bit less. The bluest areas are reflecting the near-uv wavelengths at ~225nm the most. Cyan areas reflect a broader range of near-uv light from ~275-225nm. Whiteish areas reflect the wavelengths more evenly. The poles don't seem to reflect much near-uv light at all, while the equatorial regions show a lot of scattering of the shorter wavelengths. So the colors are just showing what wavelengths are being absorbed, reflected, and possibly emitted, though I don't suspect much, if any, emission is seen here.
Can I write a more generic description of color? Sheesh. Sorry I don't know more. Probably would need to study atmospheric physics and chemistry to be of any use.
[/quote]
Geck, I really hope I don't say anything offensive here, but in my opinion blue objects look blue either because they specifically reflect blue (or green to ultraviolet) light more than they reflect yellow to red light, or else they look blue because they emit blue light. That's why I find pink a weird color to represent ultraviolet light. But mapped color is mapped color, so really pink is just a good as any other color here.
Then again, you just explained to me that blue objects that don't emit much ultraviolet light can be considered "red from an ultraviolet point of view". I can understand that, of course. That still doesn't explain the pink color of the most ultraviolet objects on Jupiter. Perhaps the color was chosen arbitrarily.
My main complaint is that today's caption doesn't explain what the different colors mean. Thanks for telling me about it, I really appreciate it, but I would prefer that the caption told me.
Ann