Speaker
Dr
Shimul Maharaj
(South African National Space Agency (SANSA) Space Science)
Description
Large amplitude electron-acoustic solitons are revisited in order to gain insights into why the phenomena of polarity switches, coexistence as well as the existence of supersolitons have been widely reported for ion-acoustic and dust-acoustic nonlinear structures but much less frequently for high frequency (electron-acoustic) nonlinear fluctuations associated with electron dynamics. The effect of streaming (warm) electrons is considered to determine to what extent is a beam responsible for supporting a switch in polarity from negative to positive polarity electron-acoustic solitons. Our results demonstrate that coexistence of negative and positive polarity electron-acoustic solitons and the existence of supersolitons of the electron-acoustic type are not easily amenable to models in which the positive species constituents are only protons. Consequently, we do not restrict our study to considering multi-temperature electron models containing only protons but models which are composed of protons and (much lighter therefore more mobile) positrons are also investigated.
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Primary author
Dr
Shimul Maharaj
(South African National Space Agency (SANSA) Space Science)
Co-author
Prof.
Ramesh Bharuthram
(University of the Western Cape)
