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I had written-

> However, the picture does show a bit of interesting atmospheric 
> disturbance,
> in that there's an inversion occurs within the lowest few minutes near the
> horizon, causing the main, highly overexposed, Sun disc to flare out at 
> its
> lower limb, just where it touches the horizon.

and Marcel replied-

The Omega-sun shows up with super-adiabatic lapse rates, i.e.
temperature gradients much less than -10�C/km. Inversions are
generally related to positive temperature gradients (where the sea is
cold and the air warm), they produce a different picture of the sun,
not an Omega-sun.

Marcel is referring here to a temperature-inversion, when the air 
temperature, instead of decreasing with increasing height, increases. I was 
not, but didn't make my meaning clear, sorry to say. The inversion I was 
referring to was not a temperature inversion, but an image inversion, in 
which a mirage-effect can cause ships near the horizon to appear 
upside-down, and that sliver of the Sun disc to be inverted in a similar 
way.

George.

contact George Huxtable, at  george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. 


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