The Effects of Upper-Hybrid Waves on Energy Dissipation in the Electron Diffusion Region.

ABSTRACT: Using a two-dimensional particle-in-cell simulation, we investigate the effects and roles of upper-hybrid waves (UHW) near the electron diffusion region (EDR). The energy dissipation via the wave-particle interaction in our simulation agrees with J?·?E ' measured by magnetospheric multiscale (MMS) spacecraft. It means that UHW contributes to the local energy dissipation. As a result of wave-particle interactions, plasma parameters which determine the larger-scale energy dissipation in the EDR are changed. The y-directional current decreases while the pressure tensor P y z increases/decreases when the agyrotropic beam density is low/high, where (x,?y,?z)-coordinates correspond the (L,?M,?N)-boundary coordinates. Because the reconnection electric field comes from -? P y z /? z, our result implies that UHW plays an additional role in affecting larger-scale energy dissipation in the EDR by changing plasma parameters. We provide a simple diagram that shows how the UHW activities change the profiles of plasma parameters near the EDR comparing cases with and without UHW.

SUBMITTER: Dokgo K 

PROVIDER: S-EPMC7583485 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature