University of Crete Island of Crete

ISEA 12. Poster Session P2 for sessions S5 and S6

Tuesday, May 20, 2008 (evening)

Conveners: J.-P. St. Maurice (S5) and A. Bhattacharyya (S6)
Poster chairs: A. Bourdillon and G. Hussey

S5: E-region plasma physics


In the past few years, we have witnessed progress in our understanding of the evolution of m and km-size irregularities, low-latitude structures of all kinds (periodic, quasi-periodic and quasi-steady), Es layers and their evolution, the modeling of meteors, and longitudinal and latitudinal variations in 150-km echoes. In this light, we welcome the submission of papers dealing with recent experimental and theoretical work dealing with E-region plasma structures at equatorial, low-, and mid-latitudes. This includes the formation, evolution, and nonlinear properties of km-size and m-size irregularities triggered by electric fields, neutral winds, sporadic Es layers, atmospheric gravity waves, and meteors. We are furthermore interested in the stability of the Es layers themselves and in the electrodynamical properties of Es patches. Our session will also welcome recent results dealing with the properties of 150-km echoes, be it from a theoretical or experimental point of view.

S6: F-region plasma irregularities: causes and effects


Equatorial F region irregularities, spanning scale sizes from hundreds of kilometers to a tenth of a meter, have been the focus of intensive investigations in the past, from the view point of their post sunset development, evolution, and decay processes, controlled by the sunset electrodynamics of the equatorial region. Current research efforts aim at a better understanding on the causes of short term and day-to-day variability of the phenomena, believed to result from the dynamic and electrodynamic coupling processes that involve forcing by atmospheric waves from below and by the magnetosphere from above. There is need to understand better the driving electrodynamics, with the competing/ complementary roles of the dynamo electric fields, conductivities, thermospheric winds, upward propagating atmospheric waves, magnetospheric forcing, etc. vis-a-vis the plasma instability mechanisms at work in the developments leading to the different phases of instability growth from the bottom type irregularities to the topside bubbles, and the evolution of small scale structures. This session provides a platform for presentation of recent results from observational, theoretical, and model studies related to the plasma physics of equatorial F region irregularities and the role of electrodynamics in the evolution and decay of spatial structure in them.

  • Equatorial spread F, more experimental results from (EAR and Jicamarca) and interpretation mechanisms
  • F region airglow measurements and structures
  • Large F region structures caused by winds, tidal and gravity waves and/or plasma instabilities
  • Short-scale, field-aligned F region irregularities and instabilities
  • F region plasma diffusion effects
  • F region electric field generation mechanisms during spread F


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