Simultaneous Global Ionospheric Disturbances Associated With Penetration Electric Fields During Intense and Minor Solar and Geomagnetic Disturbances oleh Shun‐Rong Zhang, Yukitoshi Nishimura, Juha Vierinen, Larry R. Lyons, Delores J. Knipp, Björn J. Gustavsson, Bhagyashree V. Waghule, Philip J. Erickson, Anthea J. Coster, Ercha Aa, Andres Spicher