Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa11b..03a&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA11B-03
Physics
2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2439 Ionospheric Irregularities, 2712 Electric Fields (2411)
Scientific paper
The spread-F /plasma bubble irregularity development in the post sunset equatorial ionosphere (ESF) is widely believed to arise from the generalized Rayleigh-Taylor (R-T) interchange instability mechanism. The instability is initiated from density perturbations at the bottomside gradient region of a rapidly rising F layer. Whether or not it could develop into flux tube aligned topside bubbles (plasma depletions) with cascading irregularity structures should depend upon: (a)-the intensity of the evening prereversal enhancement in the zonal electric field (PRE)/vertical plasma drift; (b)- the amplitude of the initial density perturbations and associated polarization electric fields possibly induced by upward propagating gravity waves (GWs); and (c)- the integrated conductivity of the potentially unstable flux tubes. Observations by different technique show large degree of day-to-day and short term variabilities in the ESF strength and occurrence rate that result from the factors a, b, and c. We focus in this presentation the competing/complementary roles of the PRE and GWs induced perturbations in the ESF variability during quiet as well as some magnetically disturbed conditions. The results to be discussed are based mainly on ground based radar, digisonde and optical measurements including results from some recent observational campaigns conducted in Brazil. Instability model results will discussed for a better understanding of the ESF variability.
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