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It seems to me that the discussin of impurities causing wild
colors in noctilucents relates also to the two photographs
I now have showing circumhorizontal arcs generated in jet
exhaust contrails. This ribanding of spectral color was
imparted to the contrail but not to the surrounding clouds.
Is this what we are talking about, or am I off base?
Barlow Pepin \ Sky & Tel
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