The ionosphere is high outer layer of the Earth's atmosphere, charged (ionised) by solar radiation. This charging allows radio signals to bounce off the ionosphere and propagate over long distance. The ionosphere is also sensitive to the impact of space weather, and when this happens we should see changes in the signal strength of radio transmissions. There are also signature markers for solar flare x-ray events, which are usually correlated with coronal mass ejections (CMEs).
At Dunedin Aurora we monitor:
Signals from GPS satellites are affected by disturbances in the ionosphere caused by space weather. In theory, the signal to noise ratio of each GPS satellite signal can be used to examine this:
GPS noise data is also sensitive to: physical objects that shadow the GPS sensor, low altitude of satellites (interferance by structures at the horizon, trees, etc.), and reflection off surfaces like roofs and walls.