20 04 2018 15-minute Estimated Geomagnetic Activity Index UT:min Kp 00:00 3.00 00:15 3.33 00:30 3.33 00:45 3.67 01:00 3.33 01:15 3.67 01:30 3.67 01:45 3.67 02:00 4.00 02:15 4.33 02:30 4.67 02:45 5.00 03:00 5.00 03:15 5.00 03:30 4.67 03:45 4.67 04:00 4.33 04:15 4.33 04:30 4.67 04:45 5.00 05:00 5.33 05:15 5.67 05:30 6.33 05:45 6.00 06:00 6.67 06:15 6.67 06:30 6.00 06:45 5.67 07:00 6.00 07:15 6.00 07:30 5.67 07:45 6.00 08:00 6.33 08:15 6.33 08:30 6.67 08:45 6.67 09:00 6.67 09:15 6.33 09:30 6.67 09:45 6.33 10:00 6.33 10:15 6.33 10:30 6.00 10:45 6.00 11:00 5.67 11:15 6.00 11:30 6.00 11:45 6.00 12:00 5.67 12:15 6.00 12:30 5.67 12:45 5.67 13:00 5.33 13:15 5.33 13:30 5.33 13:45 5.33 14:00 5.33 14:15 5.33 14:30 5.67 14:45 5.67 15:00 5.33 15:15 5.33 15:30 5.67 15:45 5.67 16:00 5.67 16:15 6.00 16:30 5.67 16:45 5.33 17:00 5.67 17:15 5.67 17:30 5.67 17:45 5.67 18:00 5.33 18:15 5.33 18:30 5.33 18:45 5.33 19:00 5.00 19:15 5.00 19:30 5.33 19:45 5.00 20:00 5.00 20:15 5.00 20:30 5.00 20:45 5.00 21:00 5.00 21:15 4.67 21:30 4.67 21:45 4.67 22:00 4.67 22:15 4.67 22:30 4.33 22:45 4.33 23:00 4.33 23:15 4.67 23:30 4.67 23:45 4.67