List of magnetic storms in April 2004
Location — Sarnia (geographic coordinates — 42.99 N -82.4 W | time zone UTC-04 - summer time)
Days with magnetic storms — 5
03 April 2004 — Magnetic storm of level G1
05 April 2004 — Magnetic storm of level G1
08 April 2004 — Magnetic storm of level G1
09 April 2004 — Magnetic storm of level G1
23 April 2004 — Magnetic storm of level G1
Days with geomagnetic disturbances — 9
06 April 2004 — geomagnetic disturbances
07 April 2004 — geomagnetic disturbances
12 April 2004 — geomagnetic disturbances
16 April 2004 — geomagnetic disturbances
18 April 2004 — geomagnetic disturbances
24 April 2004 — geomagnetic disturbances
25 April 2004 — geomagnetic disturbances
28 April 2004 — geomagnetic disturbances
30 April 2004 — geomagnetic disturbances
Maximum of solar activity in April 2004
Solar radio flux (10.7 cm) = 117
Mean planetary A index = 23
Mean planetary Kp index = 5