An Unusual Solar Halo Complex

Abstract

AN unusual halo complex was observed at Saskatoon, Canada, on April 16 between 8.20 A.M. and 9.15 A.M., 105th meridian time. Its appearance when the altitude of the sun was about 35° is shown in the accompanying diagram (Fig. 1). The significance of the various letters is as follows: HH, horizon; Z, zenith; S, sun; aa, halo of 22° ee, parhelia of the halo of 22° cc, c, upper and lower tangent arcs of the halo of 22° bbb, portions of the halo of 46°; d, arc tangent to the halo of 46° mm, parhelic circle; pp, parhelia of 90° tt, parhelia of 120°; h, anthelion; ss, narrow-angle oblique arcs of the anthelion; gg apparently portions of wide-angle oblique arcs of the anthelion; gg apparently secondary parhelia of the parhelia of 22°; f arc vertically above, and concave towards the sun. Coloured halos and arcs are shown by a solid and a dotted line, the latter indicating the blue side of the halo.