Notice that except for some unidentifiable parts of a structure in the foreground of the photo, there is nothing in the picture that allows the mind to establish a scale for the explosion. The viewer is unable to determine whether this is a large explosion or a small one.
Notice also that the color ranges from red through orange and yellow to nearly white. Compare the above 'nuke' to the picture just below, which is one of napalm burning:
I believe the above is from a movie stage.
The picture appears on this page: Jericho: Reconstruction recap
Below: A napalm strike:
The picture appears on this page: Western & Northern Africa Database
Below is another picture of napalm. Notice the white or almost white glare.
The above picture appears on African Bush Pilots Fly-In June 3rd 2006 Barberton Airfield, South Africa
Below is a photo of an acetylene flame burning in air. Notice the yellow to white color:
The above picture is found at: Oram Alloy Art
Below is an acetylene flame after oxygen is added. Notice that the flame loses its yellow tint and becomes blue. This is a hotter flame than the acetylene burning alone in the atmosphere:
The above picture and a discussion of oxyacetylene flames can be found at: The oxyacetylene process
So is the first picture that of a nuclear blast? Or is it just napalm, or some other hydrocarbon burning in air?
The temperature on the ground at Hiroshima is claimed to be up to 6000 C. At such a temperature there would not be a yellow flame. The yellowish color of the first photo would indicate a temperature much lower than that claimed to be produced in a nuclear blast.
