@InProceedings{Abdu:2009:EqSpDe,
author = "Abdu, Mangalathayil Ali",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Equatorial Spread F development and day-to-day Variability From
Prereversal Vertical Drift and Gravity Wave Precursors",
booktitle = "Proceedings...",
year = "2009",
organization = "2009. Joint Assembly",
keywords = "Equatorial ionosphere, Ionosphere/atmosphere interactions,
Ionosphere/magnetosphere interactions, Ionospheric irregularities,
Electric fields.",
abstract = "Rayleigh-Taylor (R-T) interchange instability mechanism. The
instability is initiated from density perturbations at the
bottomside gradient region of a rapidly rising F layer. Whether or
not it could develop into flux tube aligned topside bubbles
(plasma depletions) with cascading irregularity structures should
depend upon: (a)-the intensity of the evening prereversal
enhancement in the zonal electric field (PRE)/vertical plasma
drift; (b)- the amplitude of the initial density perturbations and
associated polarization electric fields possibly induced by upward
propagating gravity waves (GWs); and (c)- the integrated
conductivity of the potentially unstable flux tubes. Observations
by different technique show large degree of day-to-day and short
term variabilities in the ESF strength and occurrence rate that
result from the factors a, b, and c. We focus in this presentation
the competing/complementary roles of the PRE and GWs induced
perturbations in the ESF variability during quiet as well as some
magnetically disturbed conditions. The results to be discussed are
based mainly on ground based radar, digisonde and optical
measurements including results.",
conference-location = "Toronto",
conference-year = "24 - 27 may",
language = "en",
urlaccessdate = "16 jun. 2024"
}