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'At night they are primarily visible by self-generated light and only secondarily by reflection, and virtually all colors of the spectrum are reported, with a change in color often observed as the UFO accelerates.'
Dr J Allen Hynek - Speech to the American Institute of Aeronautics and Astronautics.
The Emerging Picture of the UFO Problem
Brightness and color changes are also noted, and while the sample is small (82 cases) NICAP found the following: Of the 25 cases showing a change in brightness, 23 of the changes occurred at the moment of a velocity change (a change of either magnitude or direction). Concerning the change of color, 23 cases showed a color change related to acceleration. While the supporting data are not conclusive, it appears that the spectral shift is to the red upon acceleration.
The RAND Corporation, 'UFOs: What to Do'
All UFO colors stem from energetic, ionizing radiation or radiations, generated by the UFO, which ionize the air.
Of all the visible colors, red and orange correspond to the least energy. They are also the two most common colors associated with UFO low-power operation, such as hovering or low-power maneuvers. The electrons have been given the ionization energy, but not much more, and cascade down in small energy drops corresponding to red or orange. This is statistically probable, as there are more small drops available than big ones.
UNCONVENTIONAL FLYING OBJECTS, A Scientific Analysis by Paul R. Hill
The glow / luminescence in various colours around the UFO (apparently shape depends on UFO's shape as well as its current maneuver, so the UFO's outline as seen by external observer can change), is thought to be due to ionization of surrounding air (atmosphere around the UFO "lights up", much like what happens in neon-lamps), hereafter referred to as "UFO plasma sheath". Brightness/color changes of the "UFO plasma sheath" seem to be related with thrust/acceleration
Resources about possible UFO physics/ propulsion / technology
Now we come to a different and more spectacular category - the UFO's (still mostly seen in the nighttime) that change colors.Here a remarkable pattern emerges in which the color changes are almost certainly related to the UFO's movements - hovering, speeding up, slowing down, descending, ascending, and high-speed acceleration.
A rough scale would relate the colors to motions in this way:
White - when hovering or moving at uniform speed.
Red and orange - when accelerating.
Blue or blue-white - at extremely high speeds.
Green - when making right-angle turns or performing other aerial maneuvers.
Suddenly its angle of track changed, its altitude and size increased as though its speed was in excess of 1,000 miles per hour. It closed in so fast that the first feeling was we would collide in midair. At this time its angle changed and the color changed. It then [appeared] definitely circular and reddish orange on its perimeter. It reversed its course and tripled its speed until it was last seen disappearing over the horizon
Since then I’ve learned from the boys upstairs why we saw different colours as it was coming toward us. The colours were around the perimeter. And it turned from a yellow to an orange to almost a fiery red and then almost a purplish-red. And they said that that had to do with the amount of energy being used or dissipated. It had to do with the UFO power settings. When it slowed down, close to us, in a fraction of a second, it was back to the yellow range. And it was foggy around it or a plasma mist.
Besides the incredible speed did the UFO display any other signals of a possible extraordinary origin?
Yes. A peculiar thing was seeing the object changing colors while increasing its acceleration. It went from yellow to orange then turned red. It moved away at an enormous speed until it disappeared from our sight. In a second attempt to intercept it, the object did the same thing: when the Pucara got closer, the UFO vanished at an incredible speed towards the West. Without much they could do the pilots simply quit the pursuit and returned to the base.
"At the moment when I started the last descent, I suddenly saw a white light which came directly on us at full speed in front of me, before instantly stopping at a hundred meters. When I started again the manoeuvers, the object made an odd turn to accompany our descent turn and to pace us at a hundred meters of us. After a while, the saucer, the size of an airliner, changed color, two green lights appearing at the ends with an orange gleam in the center which ignited intermittently,"
Flight Captain Jorge Polanco
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"The light would throb with an increased intensity prior to each change of colour and hover in the sky for some time and then dart and cover large distances, doing a number of right-angled turns at high speed".
Senior Constable Andrew Luhrs -Gladstone,Southern Australia,May 22, 1996
The white light moved about 90° to dead ahead position about 8-10 miles away at high speed estimated at about 800-1,000 mph where it changed color to orange and seemed to block the airliner’s path or risk collision, disappeared briefly, reappeared as an orange light again but standing still ahead of the airliner to the W.
Meanwhile,the object rapidly moved to an area northeast of the airport and once again hovered. Its colour changed from bright white to reddish orange. Through binoculars,Dickerson and others perceived it as flat and round;tongues of "flame" occasionaly extended from its edge..
UFOS change colour from blue to green to red.
originally posted by: karl 12
As Doc Hynek mentions above in his speech to the A.I.A.A sometimes UFOs have been observed changing colour (possibly due to acceleration) and there's some relevant speculative articles and info below about the subject from folks such as NASA's Paul Hill, the Rand Coporation and researchers Otto Binder and Dimitris Hatzopoulos.
Study of Color Changes Related to Motion
A special study was made of cases in which UFOs reportedly changed color during flight. A sample of 82 color change cases was accumulated. In addition, 25 cases of change in luminosity or brightness (some overlapping the color changes) were singled out for examination. Could any pattern be discovered relating these changes to the motion or maneuvers of UFOs? (...)
The colors observed during acceleration were isolated. Shifts of color toward the red and violet ends of the spectrum were studied in relation to hovering, acceleration, etc. Cases in which white, or dark (absence of color) constituted one predominating color were examined as a class. Luminosity changes were similarly analyzed.
originally posted by: jeep3r
Excellent thread premise, it seems like these color change effects are indeed linked to the UFO phenomenon and I've been pondering this myself for quite some time now. It's almost as if they sweep through the electromagnetic spectrum in terms of energy and emitted wavelengths.
Ashland, WI (AP) - Authorities in a four-county area of Northern Wisconsin have reported several recent sightings of unidentified flying objects, with nine deputies in Ashland and Iron counties saying they saw four UFOs at one time.
At the time of the sightings, officials said, police radios were garbled or went out of service and witnesses said they saw the objects moving, changing colors, and heading toward a common position in the sky..
Ashland County Undersheriff George Ree, who investigated, said he found no evidence of a landing. He left their home and drove about two miles to meet with deputies. Then, he said, he and the deputies saw four UFOs, one brighter than the others. They said the brightest one moved, changed colors, and then became stationary while three smaller objects headed toward it.
originally posted by: BASSPLYR
a reply to: framedragged
The plasmas not super conducting. A soliton phase conjugate laser turns the plasma sheath into a plasma bubble. There it functions in conjunction with the skin of the vehicle as a parallel plate waveguide in which you can induce the kerr effect, create a dielectric field inside the space between the plasma and the vehicle. Alter refractive index. Do it in accord with EM vacua. Match impedance. Make compton wavelength of em vacua accessible by coupling bosons from superconductor via induction to dielectric outside of craft.