If finite-anplitude propagation of small asplitute eaves is assed, ia
.
.
.
<0
.
accordance with the derivation of DuMond et al.
rather than the accustic astion,
a meh larger source yield is indicated.
Since ordinary Sachs scaling,“ based on a=bient conditions at burst altitude, gives auch lower than observed pressures, results would i=ply such
more than true yield; therefore, this scaling will not be considered further.
It appears that random errors of observation and the suall data sa=ple obtained by BRL for Pliumbbob Joba“3 may have been responsible for their conclusion that ordinary Sachs scaling worked best, in contrast to the modified
Sachs scaling superiority shown by Sandia seasuresents of Teapot HA.<*
Apparent-yleld-to-true-yfeld ratios have been plotted versus acbient pres-
sure at burst altitude fn Fig. 6.4.
are also shown.
Ratios predicted by Shelton@ and Bethe*
Measurements near ground zero from Teapot pact and Plu=bbob
Jobn=> have been used in the same way to calculate apparent yield.
This ratio
fs so nearly proportional to the 9.177 power of burst-level ambient pressure
that no regression was derived.
The line indicates that a curve necessary to
arrive at a unit ratio at sea level burst altitude is prisariiy dependent on
data from shots at less than 20,000 feet MSL.
This appears to conflict with
previous observations25 that the energy partition does not vary with burst altituces to 10,000 feet MSL.
.
o
A reviews of air-burst data collected in‘the past, using sodified Sach.
scaling, should be aade for.cocparison with 13M Problea M.
[t is possible
that the lower P-D curve recomcemed after Upshot/Xnothole’? 2 aay also have
resulted froa use,
for the most part, of air-burst data.
e
The early Teak signals recorded at French Frigate Sheals, shoen ia Tadle
4
0.2, arrivea at o1gn incidence angles.
This ixplies that sound speed at turn-
over altitude is hish and in tura sust be at cxtresmely hisa altitvze.
A sicple
approximation for calculating tsrmover altitule was found previcusl.
for
With, for. 19715 deleted.