Table 2 A comparison of the calculated millimeter refraction
with Ulich's formula
Refraction at 45 degrees
1 - by integration through atmosphere of IMC model at altitude 2.0 km
using ASA adjusted by dT :mean ASA temperature = 2C
by dp = 0 :ASA => press = 596 Torr
with humidity parameter h =Rel.Hum.(%)/10
Refraction R1(")
2 - by Ulich's formula with press = 596 Torr
Refraction R2(")
h dT R1 R2 Diff
2 -14 49.1 49.2 -0.1
2 -10 48.6 48.7 -0.2
2 -6 48.1 48.2 -0.1
2 -2 47.7 47.8 -0.1
2 2 47.5 47.5 0.0
2 6 47.3 47.3 0.0
2 10 47.2 47.2 0.0
2 14 47.4 47.3 0.1
2 18 47.6 47.5 0.1
2 22 48.1 47.9 0.2
2 26 48.8 48.6 0.2
2 30 49.8 49.4 0.4
5 -14 50.0 50.0 0.0
5 -10 49.7 49.7 0.0
5 -6 49.6 49.6 0.0
5 -2 49.7 49.6 0.1
5 2 50.0 49.9 0.1
5 6 50.6 50.4 0.2
5 10 51.4 51.1 0.2
5 14 52.6 52.2 0.4
5 18 54.2 53.7 0.5
5 22 56.3 55.6 0.7
5 26 59.0 58.1 0.9
5 30 62.2 61.1 1.1
8 -14 50.8 50.8 0.0
8 -10 50.9 50.8 0.1
8 -6 51.1 51.0 0.1
8 -2 51.7 51.5 0.2
8 2 52.6 52.3 0.3
8 6 53.8 53.5 0.3
8 10 55.6 55.1 0.5
8 14 57.9 57.2 0.7
8 18 60.8 59.9 0.9
8 22 64.5 63.4 1.1
8 26 69.1 67.6 1.5
8 30 74.6 72.8 1.8