DocumentCode :
747465
Title :
Reflection of Solitons at Critical Density of Negative Ions: Contribution of Thermal and Gyratory Motions of Ions
Author :
Malik, Hitendra Kumar ; Singh, Kunwar Pal ; Kawata, Shigeo ; Stroth, Ulrich ; Singh, Dhananjay Kumar ; Jain, Vinod Kumar ; Nishida, Yasushi ; Nejoh, Yasu Nori
Author_Institution :
Inst. for Plasmaforschung, Stuttgart Univ., Stuttgart
Volume :
36
Issue :
3
fYear :
2008
fDate :
6/1/2008 12:00:00 AM
Firstpage :
738
Lastpage :
747
Abstract :
On the basis of appropriate modified Korteweg-deVries (mKdV) equation derived for three cases of nn0 < ne0, nn0 = ne0, and nn0 > ne0 together with nn0 < ne0 as the density of negative ions (electrons), we observe that compressive and rarefactive mKdV solitons propagate in an inhomogeneous magnetized plasma having negative ions at their critical density. Two types of modes (fast and slow) separately evolve as the compressive and rarefactive solitons. However, only the solitons corresponding to the fast mode get reflected, if the obliqueness of the magnetic field lies under certain critical angle PsiCR which gets larger under higher thermal motions of the ions and shows stronger dependence on it when less number of negative ions are present in the plasma. There is a possibility of the change of polarities after the reflection of the solitons. The solitons suffer stronger reflection under the effect of larger ion thermal motions and smaller obliqueness of the magnetic field. The compressive solitons are found to downshift, whereas the rarefactive solitons are upshifted after the reflection, and these shifts get higher for the increasing concentration of the negative ions and lower obliqueness of the magnetic field. The compressive (rarefactive) solitons shift less (more) in the plasmas with ions of higher thermal energy; however, the upshift shows opposite behavior for the case of nn0 > ne0.
Keywords :
plasma density; plasma magnetohydrodynamics; plasma solitons; plasma theory; compressive mKdV solitons; inhomogeneous magnetized plasma; ion gyratory motion; ion thermal motion; modified Korteweg-deVries equation; negative ion critical density; negative-ion-containing plasmas; rarefactive mKdV solitons; soliton reflection; Acoustic waves; Electrons; Equations; Government; Magnetic fields; Plasma density; Plasma properties; Plasma waves; Reflection; Solitons; Compressive and rarefactive solitons; critical density; negative ions; soliton reflection; thermal and gyratory motions of ions;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2008.923745
Filename :
4539873
Link To Document :
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