A New N+ Band of Electromagnetic Ion Cyclotron Waves in Multi‐Ion Cold Plasmas
Abstract
The dispersion relation for electromagnetic ion cyclotron (EMIC) waves is analyzed for a multi‐ion cold plasma. Several cases accounting for the relative contribution of the nitrogen (N+) and the oxygen (O+) ions and wave normal angle (θ) are presented. It is found that the presence of N+ significantly changes the dispersion properties of EMIC waves, leading to a new frequency band with additional cutoff, crossover, and resonance frequencies just above the oxygen cyclotron frequency ( ). The method for estimation of ions concentration from cutoff frequencies based on observation is also revisited, and N+ concentration is determined. The minimum resonant energy of N+ band is also calculated. This new N+ band is relevant to reduce the discrepancy in mode detection near in the observed wave spectrum in order to quantify the transport and energization of N+, in addition to O+, for their relative contribution to the loss and/or scattering mechanisms.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 07, 2018
- Source ID
- 10.1029/2018gl080280
Entities
People
- Muhammad Fraz Bashir
- Raluca Ilie
Organizations
- Air Force Office of Scientific Research
- COMSATS University Islamabad
- National Aeronautics and Space Administration
- National Science Foundation
- University of Illinois Urbana–Champaign