Nonlinearity and Turbulence in Plasmas
by Dr. Prachi Sharma
at Astrophysics and Cosmology Seminar
Wed, 29 Jun 2022, 11:10
Remote Zoom Seminar
Nonlinearity and turbulence are believed to play a leading role in acceleration and heating of the particles in space and laboratory plasmas. Space offers several regions to study this turbulence phenomenon. I would like to start my talk by discussing different regions of space and brief idea about turbulence. This talk majorly focuses generation of turbulence caused by wave-wave interaction in space plasmas in the presence of Ponderomotive nonlinearity. Various spacecraft observations results are invoked to compare the results obtained by numerical simulation of our model. In the latter part of this talk, I also would like to discuss the constancy of topological invariants such as cross helicity and magnetic helicity in the case of non-ideal magnetohydrodynamics (MHD). Here we consider dissipative processes in the form of thermal conduction, finite electrical conductivity and viscosity and the effect of these processes on the helicities conservation. Obtained results indicate the non-conserve nature of these invariants in non-ideal MHD limit.
Created on 24-06-2022 by Zitrin, Adi (zitrin)
Updaded on 24-06-2022 by Zitrin, Adi (zitrin)