List of magnetic storms in September 2009
Location — Washington (geographic coordinates — 38.9 N -77.02 W | time zone UTC-04 - summer time )
Days with geomagnetic disturbances — 1
28 September 2009 — geomagnetic disturbances
Changes in the maximum daily geomagnetic index Kp in September 2009 for mid latitudes
Location — Washington (geographic coordinates — 38.9 N -77.02 W | time zone UTC-04 - summer time )

Location — Washington (geographic coordinates — 38.9 N -77.02 W | time zone UTC-04 - summer time )
28 September 2009 — geomagnetic disturbances
Solar radio flux (10.7 cm) = 76
Mean planetary A index = 8
Mean planetary Kp index = 4