Influence of the E region dynamo on equatorial spread F

Details Influence of the E region dynamo on equatorial spread F Influence of the E region dynamo on equatorial spread F

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3169h&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 3169-3173. Research supported by the Alexander von Humboldt Stiftung

Physics

15

E Region, Equatorial Atmosphere, Ionospheric Conductivity, Spread F, Altitude, Flow Stability, Gravitational Effects, Time Dependence

Scientific paper

The integrated E region Pedersen conductivity can be an important parameter in determining whether the bottomside of the equatorial F layer will be stable against the Rayleigh-Taylor gravitational instability. The F layer is observed to become unstable when it rises to great heights after sunset. One effect of this height rise is to decrease the stabilizing influence of ion-neutral collisions at F region heights. It is shown here that the same eastward electric field that raises the F layer also decreases the Pedersen conductivity of the E region, which further destabilizes convective overturning. Because the conductivity of magnetic tubes that penetrate the main F layer is large compared to the E layer contribution, these effects are important only for the bottomside of the equatorial F layer.

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