Jökull - 01.12.1962, Page 66

I and IV contain only few events Table 11
may be condensed as shown in Table 12.
The relation of the period of A oscillations
to the Ap figure is illustrated in Tables 13 and
14. The observed periocl range of the A oscilla-
tions of 0.5 to 2.5 sec is clivided into 4 sub-
ranges in Table 13 ancl into two subranges
in Table 14.
Finally the results of Table 12 ancl Table 14
may be rearrangecl in the following way in
TABLE 11
Average Ap figures for different magnitudes of A oscillations observed in California
Nov. 1. 54 to Feb. 28. 57 0 I Magnitude II III IV
Number of days or events 781 d 13 ev 48 ev 14 ev 5 ev
Average Ap (2y) 14.9 10.9 9.9 12.0 8.4
TABLE 12
Table 11 condensed.
Nov. 1. 54 to Feb. 28. 57
Number of days or events
Average Ap (2y) ............
Magnitude
0 I + II III + IV
781 d 61 ev 19 ev
14.9 10.1 11.1
TABLE 13
Average Ap figures for different subranges of the period of A oscillations
observed in California.
Period subrange
(a) (b) (c) (d)
Range in sec 0.5—0.8 0.8-1.2 1.2—1.8 CO 1 r°
Nov. 1. 54 to Feb. 28. 57
Number of events 12 30 31 7
Average A (2y) 16.1 9.7 9.2 8.2
TABLE 14
Table 13 condensed.
Period subrange
(a) + (b) (c) + (d)
Range in sec 0.5— 1.2 1.2 —2.7
Nov. 1. 54 to Feb. 28. 57
Number of events .............................. 42 38
Average Ap .................................... 11.4 9.0
64 JÖKULL