,- Ilia State University, Space Research Center, Atmosphere-ionosphere and Near Space Department, Tbilisi, Georgia
The multilayered structure of sporadic E(Es) is a well-known observable phenomenon in equatorial and mid-latitudes. This phenomenon can be caused by the presence of additional altitude regions, caused by electric field, with nodes of the vertical ion drift velocity, where near these nodes the maximum rate of their vertical convergence is achieved, which leads to the formation of Es layers. In this case, regions with maximum ion convergence rate in the lower thermosphere (at an altitude of about 90-150 km) can be caused by an electric field, in addition with the propagation of atmospheric gravity waves and tidal wind.
In this case, the combined effect of electric field, zonal wind velocity and wind shear can lead to the formation of additional Es layers, in contrast to the case where only zonal wind or/and its vertical shear factor dominates in the vertical convergence of ions.
In the case of a combined effect of these factors, the disappearance of Es layers formed in the presence of only zonal wind velocity, its vertical shear or electric field is also possible.
In the equatorial region the factor of electric field in formation and dynamics of Es layers is significant.
These processes of formation of multilayer sporadic E and/or its disappearance, using the horizontal wind model (HWM14) data and electric field (with constant vertical and zonal components in the cases of various polarizations), are considered numerically in equatorial regions.
Evolution of sporadic E with Es-type two sub-layers sometimes could lead to the formation of the high density single Es layers.
In the equatorial regions, electric field influences the ion drift velocity and therefore also can cause the displacement of layers. Here we will show the predominance of the downward motion of the Es sublayers, under influence of the electric field and the possibility of their merging into one high-density Es layer localizing in their most observable regions (about 95-105 km) of the lower thermosphere.
Acknowledgements. This study is supported by the Shota Rustaveli National Science Foundation of Georgia Grant no. FR-21-22825.
How to cite: Dalakishvili, G., Didebulidze, G. G., and Todua, M.: The role of the electric field in formation of multilayered sporadic E(Es) in equatorial regions, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-10262, https://doi.org/10.5194/egusphere-egu26-10262, 2026.
