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I'm not sure but it appears the red colouration could have been
caused by Rayliegh scattering (the same thing that causes the Sun to
appear red when near the horizon). The cirrus was not only higher
but may also have been farther away than the lower cumulous clouds so
the optical path length through the atmosphere was longer for the
cirrus than the cumulous clouds. Therefore the light from the cirrus
would have experience more scattering than the light from the
cumulous clouds, and as a result, appear more reddened.
What do you think?
Russ Sampson.
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