ATIS Telecom Glossary
Thursday, October 23, 2014

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absorption index

1. A measure of the attenuation caused by absorption of energy per unit of distance that occurs in an electromagnetic wave of given wavelength propagating in a material medium of given refractive index. Note: The value of the absorption index K' is given by the relation

equation 01#f01

where K is the absorption coefficient, is the wavelength in vacuum, and n is the refractive index of the absorptive material medium. [After 2196] 2. The functional relationship between the Sun angle--at any latitude and local time--and the ionospheric absorption.

 

 

 

 

 

 

 

 

 

 



 
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