List of magnetic storms in April 2009
Location — London (geographic coordinates — 51.51 N -0.13 W | time zone UTC+01 - summer time )
Days with geomagnetic disturbances — 1
09 April 2009 — geomagnetic disturbances
Changes in the maximum daily geomagnetic index Kp in April 2009 for mid latitudes
Location — London (geographic coordinates — 51.51 N -0.13 W | time zone UTC+01 - summer time )

Location — London (geographic coordinates — 51.51 N -0.13 W | time zone UTC+01 - summer time )
09 April 2009 — geomagnetic disturbances
Solar radio flux (10.7 cm) = 71
Mean planetary A index = 12
Mean planetary Kp index = 4