Electromagnetic Ion Cyclotron Waves in Multi-Ions Hot Anisotropic Plasma in Auroral Acceleration Region-Particle Aspect Approach

• Published in: Earth, moon, and planets Vol. 109; no. 1-4; pp. 29 - 41
• Main Authors: Patel, Soniya, Varma, P., Tiwari, M. S.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2012; Springer Nature B.V
• Subjects: Anisotropy; Astronomy; Astrophysics and Astroparticles; Cosmology; Cyclotron frequency; Distribution functions; Electromagnetics; Helium ions; Ion cyclotron waves; Ions; Magnetic fields; Observations and Techniques; Particle interactions; Physics; Physics and Astronomy; Planetology; Radio frequency plasma; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Wave-particle interactions; Auroral acceleration region; Particle aspect analysis; Electromagnetic ion cyclotron instability; Multi-ions plasma; Thermal anisotropy
• ISSN: 0167-9295; 1573-0794
• DOI: 10.1007/s11038-012-9400-4

Using particle aspect approach, the effect of multi-ions densities on the dispersion relation, growth rate, perpendicular resonant energy and growth length of electromagnetic ion cyclotron wave with general loss-cone distribution function in hot anisotropic multi-ion plasma is presented for auroral acceleration region. It is observed that higher He + and O + ions densities enhance the wave frequency closer to the H + ion cyclotron frequency and growth rate of the wave. The differential heating of He + ions perpendicular to the magnetic field is enhanced at higher densities of He + ions. The waves require longer distances to achieve observable amplitude by wave-particle interactions mechanism as predicted by growth length. It is also found that electron thermal anisotropy of the background plasma enhances the growth rate and reduces the growth length of multi-ions plasma. These results are determined for auroral acceleration region.