How does EMIC wave polarization depend on magnetospheric plasma conditions?
Abstract
Recent statistical studies indicated that linearly polarized EMIC waves are predominant at inner magnetosphere and/or off equator. Such linearly polarization is interesting because any branch of the wave mode near the heavier ion gyrofrequency should be predominantly left- or right-handed polarized except for a few exceptions near the crossover frequency or at oblique propagation near the multi-ion hybrid resonances. Recent numerical simulation using a 2D full-wave code (FW2D) shows that the waves can have linearly polarization at off equator when left-handed polarized EMIC waves generated near the magnetic equator propagate to the higher magnetic latitude (propagation effect). On the other hand, this wave code also showed that linearly polarized ultra-low frequency waves can be generated via mode conversion at the ion-ion hybrid resonance (resonance effect). In this presentation, we examine the global structure of EMIC waves and their properties, such as polarization and wave normal angle, using FW2D code. We particularly focus on linearly polarized EMIC waves appeared due to both propagation and resonance effects and compare the wave properties. The simulation results will be also compared with wave observations.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSM43C3564K
- Keywords:
-
- 2730 Magnetosphere: inner;
- MAGNETOSPHERIC PHYSICSDE: 2774 Radiation belts;
- MAGNETOSPHERIC PHYSICSDE: 7845 Particle acceleration;
- SPACE PLASMA PHYSICSDE: 7867 Wave/particle interactions;
- SPACE PLASMA PHYSICS