Amplitude and Phase Velocity of Solitary Waves in Non–isothermal Plasma

Publication Issue: 
Volume 41, Issue 1, 2020
Page No: 
Date Received: 
Sunday, May 19, 2019
Authors' Name: 
Sankar Chattopadhyay
Authors' Affiliation and Address: 
Daria J.L.N Vidyalaya , Centre for Theoretical Plasma Research , Sonargaon (Near Debaloy) , Narendrapur Station Road , P.O. - Ramakrishna Pally, P.S. - Sonarpur , Kolkata - 150, West Bengal , INDIA .
In presence of positron, ion-acoustic solitary waves for the plasma (He+,O-) are investigated with the variation of different plasma parameters in single and two-temperature non-isothermal electron plasma . The first (ϕ_1), second (ϕ_2 ) and third (ϕ_3 ) order compressive solitary wave solutions in non-isothermal plasma are calculated by well known ‘tanh – method’. Besides this, one more important point is the “spiky and explosive” solitary waves obtained from higher order solutions which Freja Scientific Satellite observations cannot explain. Again the condition for the existence of a potential well with warm positive ion, warm negative ion including their drifts and warm positron along with the critical values of negative ion concentration(n_jc ), negative ion temperature(σ_jc ), positron density (χ_c ) and phase velocity (V_c ) are well defined and analysed. Two types of phase velocities are also highlighted and discussed. We are mainly interested with first(Φ_01 ) , second (Φ_02 ) and third (Φ_03 ) order amplitudes and fast ion acoustic phase velocity (V_F ) of the solitary waves. All these are represented graphically.
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