Looking at the archives of Hiroshima led me to think of what really was behind the targeting of this city ; Imperial Japan obviously had some nuclear activities for at least the making of armour-piercing rounds ; and this can be confirmed, and it can be understood that Hiroshima was a city involved in this nuclear complex by looking at the pictures of Aug. 6 and later.
The cloud of the explosion leads to identify two sub-events ; firstly, the detonation of the nuke, at 500 meters of altitude as was set by the engineers on the altimeter of the device ; and then, that altitude blast that devastates the city triggers the explosion of a small plutogenic nuclear reactor on the soil, that plutogenic nuclear reactor explodes and its uranium 238-rich cloud rises, with hence much more smoke – the unfissionned U238. Let me use the pictures from the Deutsche Welle journalist that recently investigated the issue of the use of bad pictures for the Hiroshima & Nagasaki explosions, Amien Essif :
The first and the last image in particular show the division in two of the event. The “bubble” on the middle-right is the remain of the high-altitude blast, from Little Boy itself, at 500 meters of altitude, it triggered the blast, on the ground, of the plutogenic nuclear reactor that was in that city, it’s the cloud rising from the ground on the left, much more denser ! lots of uranium 238, a natural-uranium reactor of course for plutonium production so it’s a dense, dirty cloud rising. That reactor exploded, but it’s a very small explosion, mostly a fire, like what happened in Beirut one month ago. When the reactor explodes the burst and thermal effect of Little Boy is already mostly done, by the time the photograph has been able to turn back his neck and look at the event its shockwave is over, of course… he sees the cloud of the reactor explosion & fire rising & meeting the remains of Little Boy, that’s what he captures with his photograph, the big dense cloud from the plutogenic reactor and the thin remains of the explosion of Little Boy !
Destroying that whole city, with a kilotonnic nuclear bomb, was a calculated decision, with the belief that most of the inhabitants could have an involvement in that industry, and that hence they should not be spared.
It’s difficult to get good pictures of the Nagasaki blast yet the city hosted quite a lot of industries and this could have been related to the turning of the raw plutonium 239 into antitank weapons.
There also is this funny picture of high ranking US officers checking a map near particular debris in the Hiroshima post-nuking field, like “it was here” – look at the eyes of the officer to the right, the hatred, you can feel he hated what was here, the plutogenic nuclear reactor.