After analyzing the interaction between charge particles and strong Langmuir turbulence we find whether the protons and electron can be accelerated is relevant to the intensity of Langmuir turbulence.

What people did is they said let's define a unit of energy that represents a unit charge accelerated across a unit potential difference, and let's call that the electron volt.

Accordingly, in this range the accelerated ground-based testing to simulate electron exposure effects of space is validated.