Differences between the software Dobson v.3 and v.4
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1.Total Ozone Calculation


The MU and M is calculated for each wavelength pair separately.
old algorithm:

XAD:=(NA-ND)/((alphaA-alphaD)*MUAD*100)-(betaA-betaD)/(alphaA-alphaD)*MAD*P/MIAD/P0


new algorithm:
XAD:=(NA/MUA-ND/MUD)/((alphaA-alphaD)*100)-(betaA-betaD)/(alphaA-alphaD)*(MA+MD)*P/(MIA+MID)/P0






2. Solar Zenith Angle and MU Calculation

The new routines in the version 4.0 are based on Jean Meeus's book "Astronomical Algorithms". 
The source code is available on the request in Java or Pascal.


email:stanek@chmi.cz