List of magnetic storms in September 2009
Location — Yellowknife (geographic coordinates — 62.45 N -114.37 W | time zone UTC-06 - 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 — Yellowknife (geographic coordinates — 62.45 N -114.37 W | time zone UTC-06 - summer time )

Location — Yellowknife (geographic coordinates — 62.45 N -114.37 W | time zone UTC-06 - summer time )
28 September 2009 — geomagnetic disturbances
Solar radio flux (10.7 cm) = 76
Mean planetary A index = 8
Mean planetary Kp index = 4