After searching quite a bit for practical formulae to do this job,
I finally took the excellent work of Hugo Lorente, published by
AMSAT Argentina in the proceedings of the 1er Simposio de Comunicaciones
Satelitales y Digitales (22/23 de setiembre de 1990), and derived the
ones that are below.
(Each case presents the theoretical formula, and then a version with all constants replaced by their values).
For those who are not interested in the formulas, I've published a an on-line calculator on another page.
OJO: All formulas use metric units! (like hectoPascal (hPa), g in m/s², height in meters (m), etc.
|Presure > 226.3203 hPa|
|54.749 < Pressure < 226.3203 hPa|
|8.68 < Pressure < 54.749 hPa|
|Pressure < 8.68 hPa|
|Height < 11000m|
|11000m < Height < 20000m|
|20000m < Height < 32000m|
|32000m < Height|
0 - 11000m -0.0065°K/m 11000 - 20000m Stable 20000 - 32000m +0.001°K/m 32000 - 47000m +0.0028°K/m
|(c) John Coppens ON6JC/LW3HAZ|