Electron acoustic instability in four component space plasmas with observed generalized (r,q) distribution function

Electron acoustic instability in magnetized four component plasma has been studied by employing non-Maxwellian generalized (r, q) distribution function. We observed electron velocity distribution function using Cluster data and found that the electron distribution contains three components, cool, hot and warm beam (strahl) all showing flat-top nature. By fitting the observed distribution with the generalized (r, q) distribution, we used the fitting parameters for cool, hot and beam electron components in the numerical results. We have investigated the effect of beam density, beam temperature, beam velocity and propagation angle on the real frequency and growth rate of the electron acoustic waves in strongly magnetized plasma.