These halos may and some should exist in nature but there is no believable documentation of them... yet.

1. 120° subparhelia (Must exist! It should not to be rare. Still no photos!?)
2. nadir arc / subcircumzenith arc. (Must exist, but hard to observe.)
3. 9° Parry arcs (possible)
4. 18° Parry arcs (possible?)
5. 20° Parry arcs (possible)
6. 23° Parry arcs (possible?)
7. 24° Parry arcs (possible)
8. 35° Parry arcs (possible)
9. Kern's halo (Probably exist. Three different theories.)
10. 66° parhelia (possible from multiple scattering. Observed in Saskatoon?)
11. 73° subparhelia (Theoretical. May be possible.)
12. rotated Parry arc (Theoretical. Too faint to be seen?)
13. sun cross (Too theoretical? Needs homogenous c/a of hexagonal columns)
14. 90° parhelia / 90-98° parhelia (Incorrectly measured 120° parhelia? Lots of observations and even photos exist, none of which are convincing. However, needed ray path does exist, but will produce so faint halo that observations can not be explained with that ray path and there is not other good explanations than observation errors.)
15. superparhelic circle (ALH only, possible)

Some old and strange halo canditates

These next halos are never photographed and probably they does not exist at all. Threre is more these, but I did not bothered to list all here. These are those, which may has some "fame".

1. Scheiner's halo (=28° halo. Not the same halo as 28° halo in Lascar display? It is not clear what Scheiner saw in his display.)
2. Bouguer's halo (proably a fog bow identified as halo)
3. Hevel's halo / 90° halo (subhelic arc?)
4. 134° parhelia (120° parhelia or the blue spot of parhelic circle? Other explanation is alternative Parry orientation which also produce Barkow's arc)
5. Barkow's arc / alternative sunvex Parry arc. (One old possible observation)
6. sub 22° halo (subparhelia or reflected Lowitz arcs?)
7. Newton's elliptical halo (22° halo?)
8. Arctowsk's arcs (infralateral arcs or subhelic arc?)
9. 9° parhelic circle (does not exist according to observer)
10. Tilted parhelic circle (observation error? This is from the same observation than Hall's halo.)
11. Hall's halo (5° halo? Earlier 9° halos has been called Hall's halo. Hall's observation is odd)
12. Blake's arc (similar than Kern arc, but differently located. One observation.)
13. different sized odd radius halos (there is lots of these in old observations. You give a radii of halos and you can find an old observation for that radii)

www.somerikko.net
© Jarmo Moilanen 2005