by Andrew Kirk from about 30,000ft over the US Midwest, October
shown with permission.
Subsuns, sometimes blindingly
bright, are formed by flat plate ice
crystals in thin cloud at lower altitudes. The sun is reflected
from their upper (and lower) near horizontal surfaces. When the
plates have very small wobbles the subsun is almost a perfect reflection
of the solar disk, otherwise it is elongated.
Lakes also reflect the sun. Could this have been a reflection
from water? "Not likely.. ..I could actually use the subsun -
visible off and on
for about an hour - as a "viewfinder". Lakes would pop into view, reflecting
the sun, as the subsun 'approached' them and then they would disappear as the
subsun moved on."