Re: Complex results from real calculation

[Geordie McBain]

(Quite far off topic now.)

No, I was referring to the International Standard Atmosphere.  It's a
standard construct or model used in basic aerodynamics.  I was talking
about it rather than the actual atmosphere, because that's where the
problematic formula came from.

 `The International Standard Atmosphere is defined by the assumption
that the temperature is a particular linear function of the height h
above sea-level up to 36,093 ft. and is thereafter constant.[...] The
part of the atmosphere below 36,093 ft. is called the troposphere, the
part above that level is the stratosphere.'

(L. M. Milne-Thomson 1973 Theoretical Aerodynamics, 4th edn, Dover,
p. 38.)

O.K.?  I'm happy to continue the discussion off list.

Geordie McBain
www.aeromech.usyd.edu.au/~mcbain

On Mon, Mar 07, 2005 at 05:57:16AM -0600, address@hidden wrote:
> >Geordie McBain www.aeromech.usyd.edu.au/~mcbain 
> > ...
> > The troposphere only extends up to h=11e3 (not 100e3) after that
> > it's the stratosphere in which the temperature is constant. 
> 
> I cannot agree.
> 
> As the name 'stratosphere' indicates, the atmospheric layers
> are there 'stratified' because the temperature strongly increases
> as a result of ozone formation and resulting enhanced absorption.
> Temperature raises up to the stratopause height ( about 50km ),
> where it comes close to ground temperature again (about 270 K).
> Between 50 to 90 km altitude  T drops again and reaches an overall
> minimum at the mesopause region (85-90 km). Over there, in certain 
> regions of the atmosphere,  temperature may be as cold as 100 K (!).
> These extreme minima occur sometimes in the mesosphere above
> the summer hemisphere polar region.
> 
> 
> 
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