The balloon was at 60k'. Record for a gas balloon with a payload ~ 100k'. To get a 10 kV EMP over the US you would need a lot more altitude. To get a focused EMP (directed energy) you could do that but not a widespread EMP.
The balloon was at 60k'. Record for a gas balloon with a payload ~ 100k'. To get a 10 kV EMP over the US you would need a lot more altitude. To get a focused EMP (directed energy) you could do that but not a widespread EMP.