Magnetic Tilt Effect on Externally Driven Electromagnetic Ion Cyclotron (EMIC) Waves
Document Type
Article
Publication Date
3-28-2023
Abstract
We examine coupling of fluctuations in the solar wind with electromagnetic ion cyclotron (EMIC) waves in the magnetosphere using an advanced full-wave simulation code, Petra-M. Dipole tilt dramatically affects the coupling process. While very little wave power can reach the inner magnetosphere without tilt effects, a tilted dipole field dramatically increases the efficiency of the coupling process. Solar wind fluctuations incident at high magnetic latitude effectively reaches the ground along the field line and mode-convert to linearly polarized field-aligned propagating waves at the Alfvén and IIH resonances. Therefore, solar wind compressions efficiently drive linearly polarized EMIC waves when the dipole angle is tilted toward or away from the Sun-Earth direction.
Journal Title
Geophysical Research Letters
Volume
50
Issue
6
DOI
https://doi.org/10.1029/2022GL101544
Recommended Citation
Kim, Eun Hwa and Johnson, Jay R., "Magnetic Tilt Effect on Externally Driven Electromagnetic Ion Cyclotron (EMIC) Waves" (2023). Faculty Publications. 4949.
https://digitalcommons.andrews.edu/pubs/4949