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| Titel |
Study of nonlinear ion- and electron-acoustic waves in multi-component space plasmas |
| VerfasserIn |
G. S. Lakhina, S. V. Singh, A. P. Kakad, F. Verheest, R. Bharuthram |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 6 ; Nr. 15, no. 6 (2008-11-27), S.903-913 |
| Datensatznummer |
250012807
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| Publikation (Nr.) |
 copernicus.org/npg-15-903-2008.pdf |
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| Zusammenfassung |
| Large amplitude ion-acoustic and electron-acoustic waves in an
unmagnetized multi-component plasma system consisting of cold
background electrons and ions, a hot electron beam and a hot ion
beam are studied using Sagdeev pseudo-potential technique. Three
types of solitary waves, namely, slow ion-acoustic, ion-acoustic
and electron-acoustic solitons are found provided the Mach numbers
exceed the critical values. The slow ion-acoustic solitons have
the smallest critical Mach numbers, whereas the electron-acoustic
solitons have the largest critical Mach numbers. For the plasma
parameters considered here, both type of ion-acoustic solitons
have positive potential whereas the electron-acoustic solitons can
have either positive or negative potential depending on the
fractional number density of the cold electrons relative to that
of the ions (or total electrons) number density. For a fixed Mach
number, increases in the beam speeds of either hot electrons or
hot ions can lead to reduction in the amplitudes of the ion-and
electron-acoustic solitons. However, the presence of hot electron
and hot ion beams have no effect on the amplitudes of slow
ion-acoustic modes. Possible application of this model to the
electrostatic solitary waves (ESWs) observed in the plasma sheet
boundary layer is discussed. |
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