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Geophysical Monograph Series



  • Plasma waves—Congresses
  • Magnetospheres—Congresses
  • Comets—Congresses

Index Terms

  • 2471 Ionosphere: Plasma waves and instabilities
  • 7827 Space Plasma Physics: Kinetic and MHD theory
  • 2487 Ionosphere: Wave propagation



Quasineutral beam propagation in space

K. Papadopoulos, A. Mankofsky, and A. Drobot

The propagation of dense energetic neutralized ion beams or plasmoids injected into a plasma across the ambient magnetic field under ionospheric conditions is considered. Using a simple physical model supported by two-dimensional hybrid simulations, it is shown that thin dense beams can propagate ballistically over lengths many times their gyroradius. This occurs when the following conditions are satisfied: Δ/Ro ⪡ 1, where Δ is the cross field beam width and Ro the gyroradius of an ambient ion having a velocity equal to the beam velocity ub, and nbMb/noMo ⪢ 1, where nb(Mb), no (Mo) are the density (mass) of beam and ambient ions. The scaling of the ballistic propagation lengths and times with beam and ambient parameters is presented along with comments on the applicability of the model to space and astrophysics.

Citation: Papadopoulos, K., A. Mankofsky, and A. Drobot (1989), Quasineutral beam propagation in space, in Plasma Waves and Instabilities at Comets and in Magnetospheres, Geophys. Monogr. Ser., vol. 53, edited by B. T. Tsurutani and H. Oya, pp. 149–160, AGU, Washington, D. C., doi:10.1029/GM053p0149.

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