Case studies of coupling between the E and F regions during unstable sporadic-E conditions

Details Case studies of coupling between the E and F regions during unstable sporadic-E conditions Case studies of coupling between the E and F regions during unstable sporadic-E conditions

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1447k&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue A12, pp. SIA 12-1, CiteID 1447, DOI 10.1029/2003JA009955

Physics

11

Ionosphere: Ionospheric Disturbances, Ionosphere: Midlatitude Ionosphere, Ionosphere: Ionospheric Irregularities, Ionosphere: Ionospheric Dynamics, Ionosphere: Electric Fields (2712)

Scientific paper

Simultaneous F-region airglow, E-region coherent-scatter radar, and ionosonde observations were made in Greece during the summer sporadic-E season in 2002. In this paper we report on two case studies during which patchy sporadic-E layers were accompanied by midlatitude spread F, coherent VHF radar echoes (including two-stream echoes), and traveling ionospheric disturbances registered by the airglow instrument. We argue that these events give strong evidence that polarization electric fields are built up in the E region and are mapped upward to the F region, creating rising and falling regions in the bottomside plasma. The resulting structure creates conditions for midlatitude spread F, as detected by the ionosonde. This correlation between patchy sporadic E and midlatitude spread F is further supported in a companion paper. Upward coupling of this sort is particularly efficient in regions of F-region plasma uplift and airglow depletion, since the F-region Pedersen conductivity is low which reduces the electrical load on the E-region generator.

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