10:45 AM - 11:00 AM
[PEM15-07] Complex magnetospheric-ionospheric electric currents as a driver of spatiotemporally localized extreme ground geoelectric fields.
Keywords:Magnetosphere-ionosphere electric currents, Geoelectric field
We do not yet understand the magnetosphere-ionosphere processes that are responsible for the localized events. However, the localized geoelectric field signature has to be a reflection of localized electric currents in the magnetosphere-ionosphere system. Since the ground-level spatial localization can be on scales of the order of 100 km, it appears that the electric current source for the localization has to be in the ionosphere. There are also indications that magnetospheric tail-related processes such as bursty bulk flows (BBF) and their coupling to the ionosphere may play a role in the localization. In this presentation, I will discuss the significance of the localized geoelectric fields and speculate some of the possible drivers for the phenomenon. The presentation is a call for contributions from the entire magnetosphere-ionosphere community to address the interesting phenomenon.