The Farley instability and the polar cap E field

Details The Farley instability and the polar cap E field The Farley instability and the polar cap E field

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3698p&link_type=abstract

Journal of Geophysical Research, vol. 80, Sept. 1, 1975, p. 3698-3700.

Computer Science

Sound

E Region, Ionospheric Drift, Magnetohydrodynamic Stability, Polar Caps, Two Fluid Models, Density Distribution, Doppler Radar, Electric Fields, Electron Density Profiles, Ionospheric Electron Density, Ionospheric Sounding

Scientific paper

The theoretical distributions over the polar cap of the growth rates of the gradient and the Farley-Buneman two-stream instabilities are compared to the measured distribution of the 'slant E condition' (SEC) on polar cap ionograms. The Farley instability seems to be the most likely source of the SEC, and this opens the possibility of detecting by means of ground-based ionospheric Doppler radars whether the polar cap E field is above or below a critical field and, if above, of determining the direction of the E field and the magnitude of the critical field.

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