Geomagnetic storms — Sep 12, 2014
Geomagnetic storms in London on Sep 12, 2014
geomagnetic storm was occured — level G3.0 (Kp = 7.00)
Geomagnetic storms in the last 3 days
Changes in the geomagnetic index Kp from September 10 to 12, 2014 for mid latitudes
Location — London (geographic coordinates — 51.51 N -0.13 W | time zone UTC+00)

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Geomagnetic storms in London in September 2014
Changes in the maximum daily geomagnetic index Kp in September 2014 for mid latitudes
Location — London (geographic coordinates — 51.51 N -0.13 W | time zone UTC+00)

This chart in PNG format — high resolution
API data: JSON or TXT
Other activity indices
Index AP = 44
Index F10.7 = 152