Physics Department Seminar University of Alaska Fairbanks

J O U R N A L    C L U B


Applications of the Petra-M simulation code for the magnetospheric physics

E.-H. Kim
NASA Postdoctoral Program Fellow, JPL



We present applications of the full-wave solver, Petra-M code, for Earth magnetospheric plasma wave physics. Due to the action of the solar wind, planetary magnetic fields are compressed on the dayside and stretched on the night side, respectively, and dawn-dusk asymmetries are ubiquitous features of the plasma environment of the magnetized planets in our solar system. Extensive numerical efforts have been continuous to understand detected plasma waves by in-situ observation and their effect on the Earth's magnetospheric environment; however, realistic magnetospheric configurations cannot be easily adopted into the existing codes. In this paper, we leverage the current effort of the radio frequency (RF) wave project and adapt a full-wave simulation Petra-M code, which is originally developed for modeling RF waves in fusion devices, for planetary magnetospheres. We developed a Python module to adopt magnetic field models (dipolar, compressed, and stretched magnetic field models) and global magnetohydrodynamic (MHD) simulation code. We particularly demonstrate the ULF waves, including electromagnetic ion cyclotron (EMIC) waves. In this case, we examine how left-handed polarized EMIC waves propagate along the field line depending on the various plasma configuration, such as magnetic field shape, wave normal angle, and heavier ion density. We also examine the ultra-low frequency (ULF) wave propagations in the dipole geometry (inner magnetosphere), compressed magnetosphere (dayside outer magnetosphere), and stretched magnetosphere (nightside outer magnetosphere), respectively, and demonstrate the mode-converted shear Alfven wave propagation along the field line in various magnetic field shapes.


Friday, 28 October 2022

Hybrid on Zoom and Globe Room: