List of magnetic storms in October 1999
Days with magnetic storms — 10
10 October 1999 — Magnetic storm of level G1
12 October 1999 — Magnetic storm of level G2
13 October 1999 — Magnetic storm of level G1
14 October 1999 — Magnetic storm of level G1
15 October 1999 — Magnetic storm of level G1
17 October 1999 — Magnetic storm of level G1
22 October 1999 — Magnetic storm of level G4
23 October 1999 — Magnetic storm of level G1
24 October 1999 — Magnetic storm of level G1
28 October 1999 — Magnetic storm of level G1
Days with geomagnetic disturbances — 8
02 October 1999 — geomagnetic disturbances
05 October 1999 — geomagnetic disturbances
11 October 1999 — geomagnetic disturbances
16 October 1999 — geomagnetic disturbances
19 October 1999 — geomagnetic disturbances
21 October 1999 — geomagnetic disturbances
25 October 1999 — geomagnetic disturbances
27 October 1999 — geomagnetic disturbances