Longitude and IMF By Effects on Stormtime Low-Latitude Prompt-Penetration Electric Fields

During geomagnetically disturbed periods, transient large-scale electric fields of magnetospheric origin, known as prompt penetration electric fields, are known to strongly affect ionospheric dynamics. We examine storm-associated prompt-penetration electric fields in the low-latitude ionosphere using a recently reformulated version of the Rice Convection Model (RCM), a numerical model of the inner magnetosphere and its coupling to the ionosphere. This reformulated version of the RCM was designed to accept an arbitrary intrinsic geomagnetic field and to represent the lack of symmetry in the magnetospheric magnetic field due to the partial penetration of IMF By. In this study we assume an IGRF internal magnetic field together with an event-driven storm-time Tsyganenko external field to investigate the longitudinal dependence of the prompt penetration electric field pattern and the effects of IMF By penetration.