@Article{BarrosTakaWrasFigu:2018:ChEqPl,
author = "Barros, Diego and Takahashi, Hisao and Wrasse, Cristiano Max and
Figueiredo, Cosme Alexandre Oliveira Barros",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Characteristics of equatorial plasma bubbles observed by TEC map
based on ground-based GNSS receivers over South America",
journal = "Annales Geophysicae",
year = "2018",
volume = "36",
number = "1",
pages = "91--100",
month = "jan.",
keywords = "Ionosphere, equatorial ionosphere, ionospheric irregularities,
meteorology and atmospheric dynamics, thermospheric dynamics.",
abstract = "A ground-based network of GNSS receivers has been used to monitor
equatorial plasma bubbles (EPBs) by mapping the total electron
content (TEC map). The large coverage of the TEC map allowed us to
monitor several EPBs simultaneously and get characteristics of the
dynamics, extension and longitudinal distributions of the EPBs
from the onset time until their disappearance. These
characteristics were obtained by using TEC map analysis and the
keogram technique. TEC map databases analyzed were for the period
between November 2012 and January 2016. The zonal drift velocities
of the EPBs showed a clear latitudinal gradient varying from 123
ms(-1) at the Equator to 65ms(-1) for 35 degrees S latitude.
Consequently, observed EPBs are inclined against the geomagnetic
field lines. Both zonal drift velocity and the inclination of the
EPBs were compared to the thermospheric neutral wind, which showed
good agreement. Moreover, the large two-dimensional coverage of
TEC maps allowed us to study periodic EPBs with a wide
longitudinal distance. The averaged values observed for the
inter-bubble distances also presented a clear latitudinal gradient
varying from 920 km at the Equator to 640 km at 30 ffi S. The
latitudinal gradient in the inter-bubble distances seems to be
related to the difference in the zonal drift velocity of the EPB
from the Equator to middle latitudes and to the difference in the
westward movement of the terminator. On several occasions, the
distances reached more than 2000 km. Inter-bubble distances
greater than 1000 km have not been reported in the literature.",
doi = "10.5194/angeo-36-91-2018",
url = "http://dx.doi.org/10.5194/angeo-36-91-2018",
issn = "0992-7689",
language = "en",
targetfile = "barros_characteristics.pdf",
urlaccessdate = "27 abr. 2024"
}