As solar wind strikes the Earth during a solar storm, electric currents are generated in the outer atmosphere. This response of the Earth to the storm, appears to level off with increasing solar wind strength measured by satellites far away from the Earth. However, Earth's response to the true solar wind that strikes the Earth, has no limit and can be greater than the apparent response. The strengths are shown in units of electric field - millivolt per meter. Image credit: Nithin Sivadas, NASA Goddard Space Flight Center
