ke
a
,
wn
66.+2h 30M
63 +th 45M
800
600
400
200
bee
MEE
Ted 64: +2h
meee
67.+3h
.
;
sy
em
Soo
et
TTT ET 65. 42h ISM
68.+3h 30
i
rag
“a hes
a
-
°
1
fatal filer
OEete
re
.
Bey OE
te
pao
b
Y
Bees nee
op
rentethae
4
be
ee
a
{oa
to py
rer
ener
¢
2 4
2.
6
_
10
Confinet
1%
6 10
6
a 4
2
{4 .MC
MC
Figs 3.20 = Ioospheric Records at Rongerik Following Shot 4 by 1 3/4
to 3 i? hr (F2 Higher with Critical Frequency Less than
Normal
about 1 hr 10 min after the shot. When the shape of the Fl trace could
be discerned (as in ths last ionogram of Fig. 3.8), the values of
virtual height and critical frequency appeared to be more or less
normal.
The F2 layer, however, was mostly absent. On ite few avresi~
ances, its critical frequency was but a few tenths of a megacycle
greater than that of the Fl layer and its form <a characteristic of
a near "G condition."
(See the footnote to Sectim 3.3.1.)
Up to
plus 2 br 22 min, there were on’- thres definite appearances of the F2
layer.
Two of these are shown 2». Fig. 3.21 (at+l br 23 min and 1 br
33 min). Also showm in Fig. 3.21 are a more typical ionogram (+2 hr
5 min) and one ( 2 br 36 min) representative of the last 15 min of
records, when 8 of 15 ionograms showed a segment of an F2 trace.
48
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