Perkins instability revisited

Details Perkins instability revisited Perkins instability revisited

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10422567h&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A10, p. 22567-22576

Physics

15

Ionosphere: Ionosphere/Atmosphere Interactions, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Midlatitude Ionosphere, Ionosphere: Ionospheric Irregularities

Scientific paper

A thorough review of the Perkins instability is presented in this paper. We introduce two new elements to the earlier model presented by Perkins [1973], namely, the neutral wind velocity and gradients in the background field line integrated density and Pedersen conductivity, respectively. We derive the eigenfrequencies and growth rates for a new instability and recover the limiting cases discussed by Perkins [1973] and Miller [1997]. The presence of gradients in the background density and Pedersen conductivity reveals a new branch in the dispersion relation and can possibly enhance the Perkins instability growth rate. The need for horizontal gradients, as was pointed out by Basu et al. [1981], is essential for the generation of small-scale and kilometer-scale irregularities. The Perkins instability is shown to be enhanced by both the presence of a neutral wind and the background density and Pedersen conductivity.

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