Abstract

We report the first relative intensity measurements made to our knowledge of the 22° halo, obtained from photographic photometry of a halo of exceptional brightness and uniformity. The maximum brightness occurs at 22.8°, and a relative minimum occurs at 19.7°. The full width at one half the maximum intensity is 3.4°. A low-intensity tail reaches from 29° to 39°.

© 1985 Optical Society of America

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