Physics Department Seminar | University of Alaska Fairbanks |
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J O U R N A L C L U B |
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Applications of the
Petra-M simulation code for the magnetospheric physics |
by |
E.-H. Kim |
NASA Postdoctoral Program Fellow, JPL |
ABSTRACT 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. |
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Friday, 28 October 2022 |
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Hybrid on Zoom and Globe Room: https://zoom.us/j/796501820?pwd=R2xEcXNwZGVRbG0va29iN2REU241UT09 | |||
3:45PM |