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In addition to the "possible to see" subhorizon
halos I would add at least six phenomenon. Sub-
arcs appear certainly. Also sub-circumhori-
zontal arc should be observable. Indeed it is
easier to see than sub-circumzenithal arc (circumnadir
arc) since it appears relatively close to the
horizon. However, sun has to be higher than 58 deg
above the horizon for this phenomenon. And one should
not forget to look for the sub-anthelion that arises
from randomly oriented crystals.
Then we have sub-halos that arise from plate pyramidal
crystals. 18, 20 and 35 degree plate pyramidal
arcs will be photographed one day - maybe some other
forms too.
There are also some other subhalos which may exist
but are mybe not so easy than the above mentioned.
just to give two: sub-Kern arc and the Kern of the
sub-circumhorizontal arc.
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