Bottom-type scattering layers and equatorial spread F

Details Bottom-type scattering layers and equatorial spread F Bottom-type scattering layers and equatorial spread F

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004angeo..22.4061h&link_type=abstract

Annales Geophysicae, vol. 22, Issue 12, pp.4061-4069

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13

Scientific paper

Jicamarca radar observations of bottom-type coherent scattering layers in the post-sunset bottomside F-region ionosphere are presented and analyzed. The morphology of the primary waves seen in radar images of the layers supports the hypothesis of kudeki+bhattacharyya-1999 that wind-driven gradient drift instabilities are operating. In one layer event when topside spread F did not occur, irregularities were distributed uniformly in space throughout the layers. In another event when topside spread F did eventually occur, the irregularities within the pre-existing bottom-type layers were horizontally clustered, with clusters separated by about 30km. The same horizontal periodicity was evident in the radar plumes and large-scale irregularities that emerged later in the event. We surmise that horizontal periodicity in bottom-type layer irregularity distribution is indicative of large-scale horizontal waves in the bottomside F-region that may serve as seed waves for large-scale Rayleigh Taylor instabilities.

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