Electron acceleration mechanism in "ionospheric polarized Poleward Boundary Intensification": A new validation with 3-dimensional fluid electron acceleration simulators

The auroral oval poleward boundary auroral intensification (PBI) had been regarded the result of distant neutral line reconnection effects in the ionosphere. On the other hand, Ohtani and Yoshikawa., [2016] proposed a model in which PBI is the result of polarization process caused by plasma flows due to dayside reconnection approaching the conductivity gradient region of auroral oval. This model is an application of the theory of ionospheric polarization-Alfvenic field aligned current (FAC) proposed by Yoshikawa et al., [2013]. According to this model, Alfven waves upwelling from the ionosphere to the magnetosphere accelerate electrons downward and generating explosive auroral intensification. The purpose of our research is to investigate Alfven wave coupling between regions and 3D plasma wave-electromagnetic interaction, which explains the essential question of the above physical process, " As a result of ionospheric polarization, how can upward Alfven waves upwelling from the cold ionosphere induce explosive downward electron acceleration? Our goal is to reveal Alfven wave coupling between regions and 3D plasma wave-magnetic field interaction. As an initial step, we have developed 3D fluid electron acceleration simulators to recreate the auroral electron acceleration process associated with ionospheric polarized PBI and are constructing a more comprehensive auroral electron acceleration model. In our research, the following two simulators cover the propagation process. (1) Form the initial structure of the Alfven wave propagated by Hall-MHD. (2) Reproduce the plasma wave-magnetic field interaction in the Hall-MHD wave by simulating the two-fluid model (e.g. Shumlak et al., [2003]), which makes fluid through the first principle Vlasov-Maxwell equations system by taking the distribution function moments. The main purpose of our research is to obtain evidence of electron acceleration of 1keV~10keV per particle of electron energy by using the above two simulators under the conditions of ionospheric polarized PBI. In this presentation, we will start with a basic understanding of PBI, and explain the background, methods, and conditions of the Hall-MHD and the perfect two-fluid simulator introduced to prove the new PBI hypothesis, and then we will discuss the physics of the calculation results.