Ion Heating by Electromagnetic Ion Cyclotron Waves and Magnetosonic Waves in the Earth's Inner Magnetosphere
Abstract
Electromagnetic ion cyclotron (EMIC) waves and magnetosonic waves are commonly observed in the Earth's magnetosphere associated with enhanced ring current activity. Using wave and ion measurements from the Van Allen Probes, we identify clear correlations between the hydrogen‐ and helium‐band EMIC waves with the enhancement of trapped helium and oxygen ion fluxes, respectively. We calculate the diffusion coefficients of different ion species using quasi‐linear theory to understand the effects of resonant scattering by EMIC waves. Our calculations indicate that EMIC waves can cause pitch angle scattering loss of several keV to hundreds of keV ions, and heating of tens of eV to several keV helium and oxygen ions by hydrogen‐ and helium‐band EMIC waves, respectively. Moreover, we found that magnetosonic waves can cause the resonant heating of thermal protons. Our study indicates the importance of energy transfer from the EMIC and magnetosonic waves to ions with different species at thermal energies.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 24, 2019
- Source ID
- 10.1029/2019gl083513
Entities
People
- Chao Yue
- Craig Kletzing
- Geoffrey D Reeves
- George G. Hospodarsky
- Harlan Spence
- Jacob Bortnik
- Qianli Ma
- Richard Thorne
- Wen Li
- William S. Kurth
Organizations
- Air Force Office of Scientific Research
- Alfred P. Sloan Foundation
- Boston University
- Los Alamos National Laboratory
- National Aeronautics and Space Administration
- National Science Foundation
- University of Iowa