The aurora and solar activity archive

Searching for historical solar and auroral activity data? The archive is filled with data between the year 1996 and yesterday.

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September 1999

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1

C6.6
Kp4+

2

C5.3
Kp3+

3

C1.7
Kp4

4

C1.0
Kp3+

5

C2.0
Kp3

6

C1.7
Kp2

7

C2.7
Kp4+

8

M1.4
Kp3

9

C3.3
Kp4-

10

B8.6
Kp4-

11

C1.0
Kp4

12

C2.4
G2

13

C4.9
G2

14

C2.8
G1

15

C2.9
G2

16

C7.7
G2

17

M2.1
Kp4+

18

C2.9
Kp4

19

C9.6
Kp3+

20

C2.8
Kp3+

21

C9.4
Kp4-

22

C5.2
G4

23

C1.2
G2

24

B6.5
Kp2

25

C1.0
Kp1+

26

B5.3
G1

27

C2.1
G2

28

C4.3
G1

29

C2.2
G1

30

C1.1
G1
   
       

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Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/10/26Kp5 (G1)
Number of spotless days in 2019:269
Current stretch spotless days:42

This day in history*

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*since 1994

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