.
‘teeamaniesnenpneteresintommeye m=
PRIVACY ACT MATERIAL REMOVED
@
3.
‘The constancy ef the mea
_s@vex a period of one hour
in Table 1 is consistent with
of the cloud. ‘Meseurements by
weground sere axe not eo eonsigcent and ealculated heights apneax te deczesse
~mith time, prebably due te enincrease in true base
werd Movement ef the eloud,
data place the top ef the sloud
augeriously between 127,000 and 99,000 feet.
,
4,
She rate of rise of the cloud can be ebtained from Figce I.
<It ds to be aoted thet a marked vartical deceleration eccurred at tuo
my
dminutes, at which tine the eonspicueus lateral spreading eccurred. This | {
is in agreement with the observations of C, BE. Palmer exeppt that ectusl
a)
s@eagurement indicates the "aplashing” eecurred aguinst s barries between
*
00,000 and 110,000 fest, which may be ef significance in conection with
the usual increase in temperature at sround
_bagiven te
by
7000 feet,
Some ebuervetions
i in the &8/%6 jumpling eentro] aircraft are
plotted also in Figure 1.
*s ebservetion at 40 seconds
=!
«~
|
as the <.);
-gloud went by his altitude is in fair agreement with
|
"@eurv
e. ss
ae “y
nf
five
At
.
tes
mim
20
‘wimleo is his observation some tine after
“s ebservation is eonsiderebly lower than
“a but the
ate
? ot
mae Oe
Ate
* a ny
of Neadquarters USAF, APOAT1
perder einilar eenditions, but st 30 te 40 neutical alles from ground ez0
at the tine of Ivy King test are shown on Pigure I for scaperison.
_
ame
Be iegeme ebservations by
tt
eo, Rp
‘meep is well within the stratosphere,
.
’
ae spin,”
-,
be "The hypothesis put feeward by Professcr C. H. Paluer in his a4
mecond letter ef 2 February 1953 for the secondary fermation ef the mln '*
‘sdarge cloud appears to the author to be plausible but it aleo appears equally
“npertain that the bulk of this main eloud ended up in the
botunen
“»@O0 and 120 thousand feet. Ihe maintenance of Sts shape and fora sre believed |;
we
pn
rd
* -"ale
et
‘+o be due to its internal turbulence and unequal heat distribution. :
-mupatinate of the degree of mixing of the eesondarily farmed large main
with @ peimary column ef auclear debris, if indeed this did act intimately es
2 F4
weccur during rise, is purely harardeus quesework. As far as is know, ne
gts
tebeexvetions were made for guidance on this aspect of the proble. tt seems es
‘apparent that eempling was gonducted some thousands ef feet below the betten
-ef the min cleud, oe statements by some of the pilots ef the F-64 sampling
-yaizezeft, appears te confirs.
Te
~
“are 4a sttadint hereto an an integral partOf Ode preblena
eemosendum from itr, Po MW. Allen to Dre %. De. Urry dated 11 December 1952,° =<‘
Glecuasing a well-defined ee cctone OREFate of wine of the cloud
vend the energy ef a muclear explosion.
.
Office of the Techniondirectors “APOAT~;
3 Incls
Table 1
{9440
“
.
dade
"
Zz
~_ em ee
- we =~
owe
.