@Article{PaulinoMVWTBLFBSG:2016:PeWaLo,
author = "Paulino, I. and Medeiros, A. Fragoso and Vadas, S. L. and Wrasse,
Cristiano Max and Takahashi, Hisao and Buriti, R. A. and Leite,
Danubia and Filgueira, Samuel and Bageston, Jos{\'e} Valentin and
Sobral, Jos{\'e} Humberto Andrade and Gobbi, Delano",
affiliation = "{Universidade Federal de Campina Grande (UFCG)} and {Universidade
Federal de Campina Grande (UFCG)} and {Colorado Research
Association} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal de Campina Grande (UFCG)} and {Universidade
Federal de Campina Grande (UFCG)} and {Universidade Federal de
Campina Grande (UFCG)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Periodic waves in the lower thermosphere observed by OI630 nm
airglow images",
journal = "Annales Geophysicae",
year = "2016",
volume = "34",
number = "2",
pages = "293--301",
month = "Feb.",
keywords = "Ionosphere (wave propagation), meteorology and atmospheric
dynamics (thermospheric dynamics, waves and tides).",
abstract = "Periodic wave structures in the thermosphere have been observed at
S{\~a}o Jo{\~a}o do Cariri (geographic coordinates: 36.5° W,
7.4° S; geomagnetic coordinates based on IGRF model to 2015: 35.8°
E, 0.48° N) from September 2000 to November 2010 using OI630.0 nm
airglow images. During this period, which corresponds to almost
one solar cycle, characteristics of 98 waves were studied.
Similarities between the characteristics of these events and
observations at other places around the world were noted,
primarily the spectral parameters. The observed periods were
mostly found between 10 and 35 min; horizontal wavelengths ranged
from 100 to 200 km, and phase speed from 30 to 180 m sg-1. These
parameters indicated that some of the waves, presented here, are
slightly faster than those observed previously at low and middle
latitudes (Indonesia, Carib and Japan), indicating that the
characteristics of these waves may change at different places.
Most of observed waves have appeared during magnetically quiet
nights, and the occurrence of those waves followed the solar
activity. Another important characteristic is the
quasi-monochromatic periodicity that distinguish them from the
single-front medium-scale traveling ionospheric disturbances
(MSTIDs) that have been observed previously over the Brazilian
region. Moreover, most of the observed waves did not present a
phase front parallel to the northeast-southwest direction, which
is predicted by the Perkins instability process. It strongly
suggests that most of these waves must have had different
generation mechanisms from the Perkins instability, which have
been pointed out as being a very important mechanism for the
generation of MSTIDs in the lower thermosphere.",
doi = "10.5194/angeo-34-293-2016",
url = "http://dx.doi.org/10.5194/angeo-34-293-2016",
issn = "0992-7689",
language = "en",
targetfile = "Paulino_periodic.pdf",
urlaccessdate = "27 abr. 2024"
}