Fig. 4: space and ground-based electric and magnetic power attenuation with distance.
From: Electromagnetic power of lightning superbolts from Earth to space
a Mean-squared electric field from 2 to 5 MHz of superbolts, averaged over 1.5 ms, and measured on the ground by ECLAIR and MTRG, then scaled by WWLLN stroke energy in MJ, as a function of distance from stroke location to ECLAIR and MTRG detecting stations. b Mean-squared electric field of superbolts in space in the VLF range, averaged over a 1 s duration, scaled by the WWLLN stroke energy, as a function of the distance from stroke location to the nearest magnetic footprint (MFP) of the Van Allen Probes, from (blue circle) EFW burst mode and (red square) EMFISIS burst mode. c Same as middle for the mean-squared magnetic field. Regressions give the decay by power laws (color indicates which type of measurements are used).
