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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 5
Ann. Geophys., 21, 1153–1157, 2003
https://doi.org/10.5194/angeo-21-1153-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 1153–1157, 2003
https://doi.org/10.5194/angeo-21-1153-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 May 2003

31 May 2003

Collisional Rayleigh-Taylor instability and shear-flow in equatorial Spread-F plasma

N. Chakrabarti1 and G. S. Lakhina2 N. Chakrabarti and G. S. Lakhina
  • 1Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata- 700 064, India
  • 2Indian Institute of Geomagnetism, Dr. Nannabhai Moos Marg, Colaba, Mumbai – 400 05, India

Abstract. Collisional Rayleigh-Taylor (RT) instability is considered in the bottom side of the equatorial F-region. By a novel nonmodal calculation it is shown that for an applied shear flow in equilibrium, the growth of the instability is considerably reduced. Finite but small amounts of diffusion enhances the stabilization process. The results may be relevant to the observations of long-lived irregularities at the bottom-side of the F-layer.

Key words. Ionosphere (ionospheric irregularities, equatorial ionosphere, plasma waves and instabilities)

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