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4o3
DISTANT EFFECTS
Although distant ionosohsre effects were definitely observed
as a result of CASTLE shots, the velocity of approximately 13 kn/min
indicated by the distant effects of Shot Mike of Operation IVY is not
borne out by the CASTIS data. Despite the fact that the start of
the effects was very difficult to ascertain, large variationsof indicat
ed velocity are apparent, with values ranging from 7.7 to 15.5 lan/min,
4 detailed theory of the nature of traveling ionospheric disturbances
having velocities in this range has been developed by Martyn
Reference 5).
(see
‘It seems advisable to call attention to two apparent consist~ encies, so that future data may be examined for corroboration of
these tendencies. First, the duration of the effect appears to be
related to the yield of the device, possibly being proportional to
its square.
Second, the duration is about inversely proportional
to the distance.
No theoretical explanation can be given for these
~N
possible relations.
69
' SECRET