Aurora Forecast

The K-index quantifies disturbances in the horizontal component of earth’s magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval.

The official planetary Kp-index is derived by calculating a weighted average of K-indices from a network of geomagnetic observatories. Since these observatories do not report their data in real-time, various operations centers around the globe estimate the index based on data available from their local network of observatories. The Kp-index was introduced by Bartels in 1939.

Today

00-03h

1

03-06h

2

06-09h

2

09-12h

2

12-15h

4

15-18h

2

18-21h

2

21-00h

3

Tomorrow

00-03h

3

03-06h

3

06-09h

3

09-12h

2

12-15h

3

15-18h

3

18-21h

2

21-00h

2

Day After Tomorrow

00-03h

2

03-06h

2

06-09h

1

09-12h

1

12-15h

1

15-18h

1

18-21h

2

21-00h

1

27 Day Aurora Forecast

Apr 22

2

Apr 23

3

Apr 24

3

Apr 25

3

Apr 26

2

Apr 27

4

Apr 28

3

Apr 29

2

Apr 30

3

May 01

4

May 02

4

May 03

3

May 04

2

May 05

3

May 06

3

May 07

4

May 08

3

May 09

3

May 10

3

May 11

2

May 12

2

May 13

2

May 14

2

May 15

2

May 16

2

May 17

2

May 18

2