Excitation of short-scale density structures by drift waves during ionospheric heating

Details Excitation of short-scale density structures by drift waves during ionospheric heating Excitation of short-scale density structures by drift waves during ionospheric heating

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3285a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 21, p. 3285-3288

Physics

2

Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities

Scientific paper

In this paper we investigate the role of dissipative drift instability in exciting ``needle-like'' short scale density structures recently observed during ionospheric heating [Kelley et al., 1995; Franz et al., 1999]. A two-fluid model for a warm, collisional plasma column, representing a typical density striation is used to derive a dispersion relation for drift modes. It is found that unstable drift modes can be excited. More accurate nonlocal eigenmode analysis reveals that for Arecibo parameters, the m=3 mode is most unstable. Mixing-length estimate of the density spectrum indicates a k-2 scaling in reasonable agreement with the observed spectrum.

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