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# TroposphericAttenuation

## •Functions and parameters contained in this package:

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### •Package functions and their basic documentation along with simple examples

#### •AbsorptionCoefficientGasses

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The absorption coefficient expressed in is given by

To see an example of this we use the 1976 US standard atmosphere as a function of height and the Mid Latitude mean water vapor density as a funciton of height. Here is the value for a milimeter band frequency of 220 GHz:

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Of course at a higher elevation the attenuation is less:

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Here is a plot of the absorption coefficient as a function of frequency at sea level

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For comparison, here is the same plot at a height of 20 kilometers.s

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#### •AbsorptionCoefficientRain

A plot for a particular rain rate as a funciton of frequency in GHz (in dB/km):

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Here is the corresponding plot for horizontal polarization:

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#### •WaterVaporDensityToPartialPressure

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Of course these two functions are inverses of each other:

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