University of Crete Island of Crete

ISEA 12 Session S6

S6: F-region plasma irregularities: causes and effects

Tuesday, May 20, 2008 (afternoon)

Convener: A. Bhattacharyya
Co-conveners: R. Woodman and M. A. Abdu


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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