/sci/ - Science & Math

https://spacenews.com/planetiq-wins-60-million-noaa-contract/

> PlanetiQ’s satellites are equipped with receivers to pick up signals from the U.S. Global Positioning System, Russia’s Glonass, Europe’s Galileo and China’s Beidou global navigation satellite systems. Atmospheric density, which bends the angle of the GNSS signals, can reveal temperature, pressure, humidity and electron density in the signal’s path.

I read some speculation sometime that maybe Starlink could be used for the same too? knowing the location of the dish and satellite, you get some info about the medium between the two from the signal speed
but maybe not enough to be useful without more specialized instruments