28 09 2017 15-minute Estimated Geomagnetic Activity Index UT:min Kp 00:00 5.33 00:15 5.33 00:30 5.67 00:45 6.00 01:00 6.00 01:15 6.00 01:30 5.67 01:45 5.67 02:00 6.00 02:15 6.00 02:30 5.67 02:45 5.67 03:00 5.33 03:15 5.67 03:30 5.67 03:45 5.67 04:00 6.00 04:15 5.67 04:30 6.00 04:45 6.33 05:00 6.33 05:15 5.67 05:30 6.00 05:45 6.00 06:00 5.67 06:15 5.67 06:30 6.33 06:45 6.67 07:00 6.67 07:15 6.33 07:30 6.33 07:45 6.33 08:00 6.67 08:15 6.00 08:30 6.67 08:45 6.67 09:00 6.33 09:15 6.67 09:30 6.33 09:45 6.33 10:00 6.33 10:15 6.33 10:30 6.33 10:45 6.33 11:00 6.00 11:15 6.00 11:30 6.00 11:45 6.00 12:00 5.67 12:15 5.67 12:30 6.00 12:45 5.67 13:00 5.00 13:15 5.00 13:30 5.00 13:45 5.00 14:00 4.67 14:15 4.33 14:30 5.33 14:45 5.00 15:00 4.67 15:15 4.67 15:30 4.33 15:45 4.33 16:00 4.33 16:15 4.33 16:30 4.33 16:45 4.33 17:00 4.33 17:15 4.00 17:30 4.00 17:45 4.00 18:00 4.33 18:15 4.67 18:30 4.33 18:45 4.33 19:00 4.33 19:15 4.33 19:30 4.67 19:45 5.00 20:00 5.33 20:15 4.67 20:30 4.00 20:45 4.33 21:00 5.33 21:15 5.00 21:30 4.33 21:45 4.67 22:00 4.00 22:15 4.00 22:30 4.00 22:45 4.00 23:00 4.00 23:15 4.00 23:30 4.33 23:45 3.67