Oblique Electromagnetic Ion Cyclotron Instability with A.C. Electric field for Loss-cone Distribution Function

J. Kumari¹ , R. S Pandey² , G Varughese³ , K. M Singh⁴

1. Dept. of Physics, Amity Institute of Applied Sciences (Amity University), Noida, India.
2. Dept. of Physics, Amity Institute of Applied Sciences (Amity University), Noida, India.
3. Dept. of Physics, Veer Kumar Singh University, Ara Bihar, India.
4. Dept. of Physics, Veer Kumar Singh University, Ara Bihar, India.

Correspondence should be addressed to: rspandey@amity.edu.

Section:Research Paper, Product Type: Isroset-Journal
Vol.5 , Issue.4 , pp.1-12, Aug-2017

Online published on Aug 20, 2017

Copyright © J. Kumari, R. S Pandey, G Varughese, K. M Singh . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Electromagnetic ion cyclotron (EMIC) waves play an important role in magnetospheric dynamics and their global distribution has been of great interest. In this paper, the effect of cold plasma injection on oblique propagating Electromagnetic Ion Cyclotron waves in the presence of A.C electric field due to distribution of hydrogen ions in a background plasma having bi-maxwellian and also loss-cone distribution function has been examined in the magnetosphere of Earth. In these cases the effect of cold plasma injection and other parameters have been compared. Applying kinetic approach, expression for dispersion relation and growth rate has been derived. It is found that the A.C frequency has profound effect on growth rate for both bi-maxwellian and loss cone distribution. Growth rate increases with increase in the A.C. frequency. Increase of temperature anisotropy also increases the growth rate, thus it can be concluded that the source of free energy for this instability is not only temperature anisotropy but also A.C. field frequency. There is marginal decrease in growth rate with increase in angle of propagation for bi-maxwellian distribution but for loss cone distribution, growth rate increases significantly. The ratio of cold injected plasma to background plasma (nc/nw) reduces the growth rate.

Key-Words / Index Term :
Magnetosphere of Earth, Ion-cyclotron waves, Cold Injection, Loss cone distribution Functions

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