Jökull - 01.12.1962, Page 64

TABLE6
Average Ap figures for different magnitudes of DP oscillations observed in Californiu.
0 1 Magnitude II III IV (I to IV)
Nov. 1. 54 to Dec. 31. 55
Number of days 385 12 20 9 — 41
Average Ap (2y) 10.4 12.1 11.8 15.0 12.7
Jan. 1. 56 to Feb. 28. 57
Number of days 403 2 12 6 1 21
Average Ap 17.9 7.5 15.8 25.1 27 18.1
Nov. 1. 54 to Feb. 28. 57
Number of days 788 14 32 15 1 62
Average Ap 14.3 11.5 13.3 19.3 27 14.6
TABLE7
Average Ap figures for different subranges of the period of DP oscillations
observed in California.
Period subrange
Range in sec <30 30 — 50 50 — 80
Nov. 1. 54 to Feb. 28. 57
Number of days ......................... 5 1930iA
Average Ap (2y) ........................ 13.4 15.7 13.8
> 80
5
33.8
TABLE8
Average Ap figures for different magnitudes of DI oscillatiotis observed in California.
0 I Magnitude II III IV
Nov. 1. 54 to Dec. 31. 55
Number of days 403 16 5 1 1
Average Ap (2y) 10.0 7.5 13.5 32.5 62.5
Jan. 1. 56 to Feb. 28. 57
Number of days 272 45 79 21 7
Average Ap 12.8 17.0 25.5 33.7 46.7
Nov. 1. 54 lo Feb. 28. 57
Number of days 675 61 84 22 8
Average Ap 11.2 14.5 24.7 33.7 48.7
62 JÖKULL