@Article{LimaBatiPaul:2018:MeRaTe,
author = "Lima, Lourivaldo M. and Batista, Paulo Prado and Paulino, Ana
Roberta",
affiliation = "{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual
da Para{\'{\i}}ba (UEPB)}",
title = "Meteor radar temperatures over the brazilian low-latitude
sectors",
journal = "Journal of Geophysical Research: Space Physics",
year = "2018",
volume = "123",
number = "9",
pages = "7755--7766",
month = "Sept.",
keywords = "mesopause temperature, meteor radar, atmospheric dynamics.",
abstract = "Meteor radar observations have been used to estimate the
mesospheric temperatures at 90-km height over the Brazilian
low-latitude sectors by applying gradient- and pressure-based
techniques. The measurements have been taken from meteor radars
operating at Cachoeira Paulista (22.7 degrees S, 45 degrees W),
from 2002 to 2006, and SAo JoAo do Cariri (7.4 degrees S, 36.5
degrees W), between mid-2004 and 2008. The temperatures estimated
from meteor data by the two techniques, using local models for
temperature gradient and pressure, showed a good agreement with
temperatures from Sounding of the Atmosphere by Broadband Emission
Radiometry over both sites. The seasonal behavior of the
temperatures estimated from meteor data, and from Sounding of the
Atmosphere by Broadband Emission Radiometry instrument, is
characterized by a semiannual oscillation (SAO) with maximum
values during equinoxes, which coincide with the westward phase of
the mean zonal wind as well as with SAO on diurnal tidal
amplitudes over both sites. The lag phases between SAO on
temperatures and on winds (or on diurnal tidal amplitudes), near
equator, have been stable in time indicating a seasonal cycle and
the dynamic coupling of the tropical mesosphere through nonlinear
interactions between oscillations from stratosphere. Although the
time series used are short to establish reliable trends or solar
effects, the temperatures over Cachoeira Paulista showed a
decrease between 2003 and 2006, just when F10.7 index has declined
in a rate of 15.3sfu/year, while over SAo JoAo do Cariri only a
slight decay has been observed on temperatures by gradient
technique obtained from mid-2004 to 2008, when F10.7 decrease rate
was 9.2 sfu/year.",
doi = "10.1029/2018JA025620",
url = "http://dx.doi.org/10.1029/2018JA025620",
issn = "2169-9402",
language = "en",
targetfile = "lima_meteor.pdf",
urlaccessdate = "28 abr. 2024"
}