Physical aspects of dispersion (dependence of refraction factor value from frequency) emergence in case of radiowave propagation in atmosphere with nonlinear dependence of atmosphere refraction factor value from coordinates have been considered. A dispersion phenomenologic model proved by results of nature measurements in surface millimeter range direct visibility radioline has been put forward.
Yuri Mikhailovi Galaev,
"Model of radiowaves dispersion in atmosphere", Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994); doi: 10.1117/12.177962; https://doi.org/10.1117/12.177962