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The only optical effect I've seen (but not in the flesh) this month
was what Greenler calls a "heiligenschein streak" but might be better
called an opposition effect streak.. On a bright sunny afternoon last
week I took some landscape photos. While assembling them into a
panorama I noticed on a field of barley stubble an odd bright diffuse
line going upwards from my shadow. Only the very top of the latter
was visible because I had tried to avoid getting it in the picture.
That
bit of shadow also had a bright area around it. I had missed seeing
an opposition effect glow! The barley stalks were hiding their own
shadows at the antisolar point making it appear bright. The bright
streak above the antisolar point resulted from the vertical stalks still
hiding their own shadows in those directions. To the left and right they
did not.
I must go back and better picture ~ but the sun has refused to shine
ever since!
To all, Seasons Greetings and many halos in 2003!
Les Cowley
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