Electron acoustic solitary waves with non-thermal distribution of electrons

Electron-acoustic solitary waves are studied in an unmagnetized plasma consisting of non-thermally distributed electrons, fluid cold electrons and ions. The Sagdeev pseudo-potential technique is used to carry out the analysis. The presence of non-thermal electrons modifies the parametric region wher...

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Bibliographic Details
Published in:Nonlinear processes in geophysics 2004-01, Vol.11 (2), p.275-279
Main Authors: Singh, S V, Lakhina, G S
Format: Article
Language:English
Subjects:
Astrophysics
Cosmology and Extra-Galactic Astrophysics
Earth Sciences
Physics
Sciences of the Universe
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Summary:Electron-acoustic solitary waves are studied in an unmagnetized plasma consisting of non-thermally distributed electrons, fluid cold electrons and ions. The Sagdeev pseudo-potential technique is used to carry out the analysis. The presence of non-thermal electrons modifies the parametric region where electron acoustic solitons can exist. For parameters representative of auroral zone field lines, the electron acoustic solitons do not exist when either alpha > 0.225 or T sub(c)/T sub(h) > 0.142, where alpha is the fractional non-thermal electron density, and T sub(c)(T sub(h)) represents the temperature of cold (hot) electrons. Further, for these parameters, the simple model predicts negatively charged potential structures. Inclusion of an electron beam in the model may provide the positive potential solitary structures.
ISSN:1607-7946
1023-5809
1607-7946
DOI:10.5194/npg-11-275-2004