Propagation

RELATIONSHIP BETWEEN KP INDEX AND A INDEX

AP INDEX

KP INDEX

DESCRIPTION

0

0

Quiet

4

1

Quiet

7

2

Unsettled

15

3

Unsettled

27

4

Active

48

5

Minor storm

80

6

Major storm

132

7

Severe storm

208

8

Very major storm

400

9

Very major storm