@Article{AbduKheBatReiSob:2014:EqSpIn,
author = "Abdu, Mangalathayil Ali and Kherani, Esfhan Alam and Batista, Inez
Staciarini and Reinisch, B. W. and Sobral, Jos{\'e} Humberto de
Andrade",
affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Equatorial spread F initiation and growth from satellite traces as
revealed from conjugate point observations in Brazil",
journal = "Journal of Geophysical Research: Space Physics",
year = "2014",
volume = "119",
number = "1",
pages = "375–383",
keywords = "electric fields, equatorial ionosphere, ionosphere/atmosphere
interactions, ionospheric irregularities, plasma waves.",
abstract = "A better understanding of the precursor conditions for the
instability growth is very important for identifying the causes of
day-to-day variability in the equatorial spread F (ESF)/plasma
bubble irregularity development. We investigate here the satellite
trace (S-trace) in the ionograms, a precursor to the postsunset
ESF occurrence, as observed by Digisondes operated at an
equatorial and two magnetic conjugate sites in Brazil during a
66\ day observational campaign (Conjugate Point Equatorial
Experiment 2002). The satellite traces first occur at the
equatorial site, and sequentially, after a variable delay of
approximately 20 to 50\ min, they are observed nearly
simultaneously over the two conjugate sites. The evening
prereversal enhancement in the zonal electric field/vertical drift
is found to control its development. Using a three-dimensional
simulation code based on collisional interchange instability
mechanism, it is shown that the observed S-trace occurrence
sequence is fully consistent with the instability initiation over
the equator with the field-aligned plasma depletion vertical
growth marked by latitudinal expansion of its extremities to
conjugate locations. The delay in the S-trace occurrence at the
conjugate sites (a measure of the nonlinear growth of the
instability for plasma depletion) is controlled also by field line
parallel (meridional) neutral wind. The relationship between the
S-trace and the large-scale wave structure in the F layer, another
widely known characterization of the precursor condition for the
ESF development, is also clarified.",
doi = "10.1002/2013JA019352",
url = "http://dx.doi.org/10.1002/2013JA019352",
issn = "2169-9402",
label = "self-archiving-INPE-MCTI-GOV-BR",
language = "en",
targetfile = "jgra50748.pdf",
urlaccessdate = "27 jun. 2024"
}