The Circumscribed Halo

Date & Time: Apr 22 2006, 14:05 JST(+0900), 1/750sec. Exp.
Optical: SIGMA 15mmF2.8 EX FISHEYE, Aperture: F13.5
Digital Camera: Fujifilm FinePix S2Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...JPEG-FINE(3024 x 2016)
CCD sensitivity...ISO100, White Balance...Auto

On same condition that we can observe the tangent arcs displayed in previous page, we can see the elliptical halo captured in this picture only when the solar elevation is higher than 40 degrees. Although this picture hardly shows you the inner halo, the elliptical halo looks connected with the inner halo at the top and bottom parts, we call the rare halo "The circumscribed halo". This halo has a characteristic that right and left parts can be seen unclearly.

The Upper Tangent Arc

The Parhelia

Copyright(c) 2006 by Naoyuki Kurita, All rights reserved.
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