Forum Replies Created
-
Posts
-
You have my reaction on the identification help , Gregory.
You have to look well, but it is there…
Lowbow
You spotted a gorgeous partial cloudbow, Gregory. Nothing mysterious about this one in my opinion. In the same way a rainbow can be partial, also a fogbow can be partial. The bow is only there where the tiny droplets of the clouds in the middle reflect, refract and diffract the light to form the bow. I hope to spot one like that too…. next year?
Amazing pinks and purples in your #915 and #916 as well. Wizardry with colors for sure.
Your radiant display is overwhelming Keelin.
I love the soft tones and colors in your Holiday Morning, Ruth.
Magnificent beams Gregory in your Flowing Forth.
Last Glimpse
Michael, #248, #249 and #250 are very intriguing.
Keelin I love your Strange Landscape, definitely with some Cookie Dough.
A comb Of Hairy CirrusI found this link about the possibility of seeing a rainbow in the snow (a so called snowbow): Can snow form snowbows?.
The bow we see here is rather faint and colorless although there still are some reds and blues. This is a cloudbow or fogbow. The sizes of the droplets that make this bow appear, are smaller than the ones that usually form a rainbow with distinct colors. It is explained here: Cloudbow.
I hope you like it. Great image Ally!
Hello Ann,
This is an amazing image. Is it right that it shows the same event as the image on the gallery by Chip Stone? Gallery
Yes I think we see a supralateral arc here (among many others). On the gallery it is classified as a 46 degrees halo. Always difficult to distinguish, but a rule of thumb is that the supralateral arc must touch the CZA, while the 46 degrees halo is a bit below. That’s why I think it is supralateral arc.
I love your B&W version of the cross hatched patterns. It is like you say yourself: “the shapes illustrating the magic world of wind patterns in the atmosphere”. We are walking on the bottom of an gaseous ocean formed by the the troposphere.
I think the answer for your puzzle is to realize that what seems to be one cloud can be different layers of clouds. When there are layers of the same kind of clouds we classify them as duplicatus. Winds high up there differ very much with height and that way you can find cross hatched patterns. The differences in wind directions at different levels betray the duplicatus nature of the clouds.
This is a nice example on the gallery: Duplicatus.
That is a nice question Ramona. i will try to annswer it.
In fact the colors of a corona and the colors of an iridescent cloud are both caused by the diffraction of light by small particles or tiny water droplets. When the droplet or particle sizes are varying a lot the pattern will be rather chaotic. In the case of a corona the particles have to be rather uniformly sized to give the regular pattern of rings. The smaller the size of the water droplets is, the larger the corona is. And when the sizes of the droplets are (almost) everywhere the same, the pattern of a corona is symmetric and circular.
Here is an example of a partial corona Solar corona and iridescence . Where the pattern becomes more chaotic it is named iridescence.
Here is an example from the gallery of a corona with very irregular rings showing the differences in sizes of the (water) particles that cause the diffraction: Irregular rings
So in my opinion there is not much difference between iridescent clouds and a partial corona except that a corona is a more specific appearance of iridescence surrounding the sun or moon. So the images you posted show me a corona and iridescence as well. The rule of thumb I use, is that a corona does not need to be a full circle to be a corona and that iridescence becomes a corona when it is somehow (partly or fully) encircling the sun or moon. I hope you like it. Any other opinions are welcome btw.
Dear Bonny and Amanda, I suggest you address you question per mail to the general e-mail account of the CAS Community: community@cloudappreciationsociety.org.
Success!
Hans
