On September 7-8, 2017, a severe geomagnetic storm (Kp ~8) triggered severe ionospheric disturbances. These disturbances caused severe disruptions in satellite navigation and radio communication. The stations displayed here show data from September 6 to September 9, 2017. The noise level in the TEC time series changes drastically during the storm, especially in the high-latitude stations, whereas the mid-latitude and low-latitude stations are relatively less affected. Zoom out from the original view to be able to see four days of data and the relative noise levels.