Contrail Shadows

A low sun casts long shadows of contrail remnants onto the thin veil of cirrus below.

A low sun and an irregular contrail cast long fingers of shadow across other clouds.

The low early morning Sun (4 degrees altitude) is off to the lower right and the contrails appear to cast shadows on the thin cirrus. However things may not be as simple as they first appear, the shadows are probably being cast on slightly hazy air below the cirrus.

Zooming in shows a curious section of shadow leading off from the fresh curved contrail in the centre, as if only one section of contrail is casting a shadow. The reduced scattering from contrail shadows in other planes is probably too weak to show up as a distinct shadow from my viewpoint.

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