hi.i have a project about (weather effect on radio waves propagation). i want more text on pdf about it.thanks

Answer 1

I can't help much on the PDF files, but do a search for "tropospheric bending" and you should find a good bit to get you started.

Answer 2

The nature of your quest is unclear. Radio waves propagate differently at different frequencies and they also react to weather differently. For example millimeter waves are very sensitive to moisture and this limits their usability. There are some interesting rain data at terabeam.com.

At lower frequencies tropospheric reflection extends propagation distances but there is minimum weather that reaches those altitudes.

At the higher frequencies (like 60 GHz.) there can be significant absorption by the oxygen in the atmosphere as well.

Google "spectral absorption" and "radio propagation" for more choices.