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Pramana

, Volume 18, Issue 6, pp 473–484 | Cite as

Surface instability of a current carrying plasma under the influence of a high frequency electric field

  • N Gopalswamy
  • S Krishan
Plasma Physics

Abstract

Surface instability of a collisionless semi-infinite current carrying plasma is studied. The semi-infinite plasma bounded by a plane surface is under the influence of a high frequency (hf) field. There are two classes of surface modes. One is a normal extension of zero high frequency field and the other due entirely to the presence ofhf field. As expected, with the increase in thehf field, the growth rates of the surface instabilities decrease. There are regions defined by the electron drift velocityu where the unstable surface and bulk regions overlap. The interesting result is that unlike the bulk plasma, there is a stable region on theu-axis flanked by two unstable regions. The width of this stable region increases with the increase in the field strength.

Keywords

Surface instability surface modes bulk modes, stable region external high frequency field growth rate two-stream instability 

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References

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Copyright information

© Indian Academy of Sciences 1982

Authors and Affiliations

  • N Gopalswamy
    • 1
  • S Krishan
    • 1
  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia

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