@Article{SmithRodrPaul:2015:RaSaIn,
author = "Smith, J. M. and Rodrigues, F. S. and Paula, Eurico Rodrigues de",
affiliation = "{University of Texas at Dallas} and {University of Texas at
Dallas} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Radar and satellite investigations of equatorial evening vertical
drifts and spread F",
journal = "Annales Geophysicae",
year = "2015",
volume = "33",
pages = "1403--1412",
keywords = "Ionosphere (electric fields and currents, equatorial ionosphere,
ionospheric irregularities).",
abstract = "We analyzed pre-midnight equatorial F region observations made by
the 30 MHz coherent backscatter radar of S{\~a}o Luis, Brazil
between August 2010 and February 2012. These measurements were
processed, and used to create monthly maps of the echo occurrence
as a function of local time and height. The maps show the
inter-annual variability associated with equatorial spread F (ESF)
occurrence in the Brazilian longitude sector. We also constructed
monthly curves of the evening vertical drifts, for the Brazilian
sector, using measurements by the ion velocity meter (IVM) onboard
the C/NOFS satellite. The IVM evening drifts show a good overall
agreement with the Scherliess and Fejer (1999) empirical model.
Measured and model drifts show the development of the pre-reversal
enhancement (PRE) of the vertical plasma drifts during ESF season.
Using joint radar and satellite measurements, we found that
evening (18:0018:30 LT) mean non-negative drifts provide a
necessary but not sufficient condition for the occurrence of
topside ESF echoes. Evening downward (negative) drifts preceded
the absence of topside ESF irregularities.",
doi = "10.5194/angeo-33-1403-2015",
url = "http://dx.doi.org/10.5194/angeo-33-1403-2015",
issn = "0992-7689",
language = "en",
targetfile = "2015_smith.pdf",
urlaccessdate = "28 abr. 2024"
}