Beschreibung
How do rainbows form? What exactly are mirages? Explore nature's most fantastic tricks of light with simple scientific explanations of how the brilliant colors come alive. In this video we also showcase and explain halos, pillars, mirages, crepuscular rays, glories, iridescence and other funny ways the spectra of light appear on our spectacular planet.
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HOW DO RAINBOWS FORM
When visible sunlight enters a raindrop it REFRACTS, separating into many different wavelengths. Each different wavelength appears as a different color. Some of that light is then REFLECTED off the back of the raindrop,
refracts again and then travels to observers appearing as the bowing spectrum. All rainbows are optical illusions. They do not exist in specific spot in the sky, rather in your head. You cant see a rainbow at midday unless you’re high above the horizon looking down. The closer to sunrise or sunset, the higher the rainbows arc into the sky
THE SECONDARY RAINBOW
The secondary rainbow appears when the light reflected twice inside the raindrop is bright enough for detection. Because this light is reflected twice, the order of the colors are reversed. The band of darker sky between the two rainbows is sometimes called “Alexander’s dark band.”
HIGHER ORDER BOWS
In rare conditions a third rainbow can be seen but its extremely faint and you’d have the sun in your eyes.
SUPERNUMERARY ARC / BOWS
Sometimes rays bouncing around in the rain cause interference. The result can be bonus bands of color usually underneath the primary bow. These are called Supernumerary arcs or bows.
MONOCHROME RAINBOW or RED RAINBOW
The farther sunlight travels through our atmosphere,
the more the shorter blue and violet wavelengths are scattered,
becoming less visible. When only the long-wave red remains visible. A monochrome rainbow or red rainbow may appear. Anywhere you have sunlight interacting with water droplets and an observer in the right spot,
you can have some kind of bow.
FOG BOW or WHITE BOW
The tiniest water droplets in fog tend to make a white bow or fog bow
Also called a mist bow or a ghost bow.
GLORY
Small rings of color most often seen around an airplane’s shadow is called a glory. These are most often visible when the viewer is above the horizon looking down. The closer your position to the clouds, the larger the shadow. In special conditions a hiker climbing through fog pondering the meaning of life may see a glory around their head and believe they’re on to something. This is sometimes called Brocken spectre or specter of Brocken. Because glories are optical phenomenon, only the observer's own shadow will have the crown of color, but their buddies will only see the glory around their own head.
more soon...