@Article{PimentaSaBiAbTaTa:2004:PlBlOb,
author = "Pimenta, A. A. and Sahai, Y. and Bittencourt, Jos{\'e} Augusto
and Abdu, M. A. and Takahashi, Hisao and Taylor, M. J.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Utah State University}",
title = "Plasma blobs observed by ground-based optical and radio techniques
in the Brazilian tropical sector",
journal = "Geophysical Research Letters",
year = "2004",
volume = "31",
abstract = "Ground-based optical and radio observations were carried out in
the tropical region in Brazil, during the period from October 1998
to September 2000, and on several occasions we detected F-region
plasma blob (localized discrete plasma density enhancement)
events. These are the first observations of blobs in the tropical
F-region using combined ground-based optical and radio techniques.
Allsky images were used to map the spatial extension and temporal
location of plasma blobs and ionosonde and photometer measurements
were used to measure the plasma densities. Interesting cases of
plasma blob events were observed on October 07, 1999 and March 04,
2000 over Cachoeira Paulista (22.7S, 45.0W; magnetic latitude
13.25S, declination 20W), showing discrete plasma density
enhancements near regions of plasma density depletion structures
in the OI 630.0 nm emission images. In these two cases, the
electron densities were enhanced by a factor of, approximately, 2
above the background level. In this paper we report the first
ground-based observations of the plasma density enhancements, or
blobs, and their association with equatorial spread-F plasma
depletions, and suggest a possible mechanism for their
generation.",
doi = "10.1029/2004GL020233",
url = "http://dx.doi.org/10.1029/2004GL020233",
issn = "0094-8276",
language = "en",
targetfile = "Alexandre A Pimenta2.pdf",
urlaccessdate = "03 maio 2024"
}