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even for the 39 nanoseconds of fusion

Right, it would be only over the 39 nanoseconds. Which is an insane energy release. Hard to imagine it's all over but the crying in that short period of time.

Let's calculate the actual energy release compared to the sun.

Sun is 3.8 x 10^23 kiloWatts/sec.

Divide by 1.0 x 10^9 sec to get the net output per nanosecond give us:

Sun output = 3.8 x 10^14 kiloWatts/nanosec x 1000 to get watts.

Sun output per nanosec = 3.8 x 10^17 watts x 39 nanoseconds

Sun output for 39 nanosecs = 3.8 x 10^17 watts x 39 =1.482 x 10^19 watts

Claimed Tzar Bomba output = 5.4 x 10^24 watts

Either my physics is rusty, or you are correct. Something doesn't add up. I'm going to see if there is a source for the output on Wiki.

Your physics is rusty. During those 39 ns, the average power output of the tsar bomba was 5.4 * 10^24 watts (50 megatons / 39 ns). At any particular moment, the sun is outputting energy at a rate of 3.85 * 10^26 watts.

Dividing through, the bomb was about 1.4% of the sun, for those brief 39ns. It sounds amazing, because it is. Should conditions make the need for such a device practical, it is technologically feasible to have the brightest object in the solar system right here on Earth.

“Sun is 3.8 x 10^23 kiloWatts/sec.”

Here’s a problem. A Watt is a Joule/sec so it’s already “per time”.

Compare Joules released in the bomb total vs joules released by the Sun in 40 ns.

A kiloton TNT is 4.18E+12 Joules.