The ISA
- defines a standard atmosphere model.
- is referenced from the equator.
- is taken from 45 degrees latitude.
Explanation from PART66Online
The International Standard Atmosphere is referenced to conditions at 45 degrees latitude, giving the agreed baseline of 15 degrees C, 1013.25 hPa and a 1.98 degrees C per 1000 ft lapse rate at mean sea level. It is not referenced from the equator, where surface conditions are warmer, and it is a fixed standard rather than the live atmosphere.
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Syed Hussain asked · 5 Dec 2012
I think The ISA assume a standard day is the right answer
Community Comments (1)
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sierra3
11 Feb 2014
The international standard atmosphere are standard values of temp, press etc taken from 45 degrees latitude, it is a statement
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