@InProceedings{BilibioWrFiScPaTa:2018:MeGrWa,
author = "Bilibio, Anderson Vestena and Wrasse, Cristiano Max and
Figueiredo, Cosme Alexandre Oliveira Barros and Schuch, Nelson
Jorge and Paulino, I. and Takahashi, Hisao",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal de Campina Grande
(UFCG)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Medium-scale gravity waves observed in the airglow over Cachoeira
Paulista",
year = "2018",
organization = "Latin American Conference on Space Geophysics, 11. (COLAGE)",
abstract = "Medium-scale gravity waves were observed in the mesosphere and
lower thermosphere region between 1998 and 2013 at the Observatory
of Cachoeira Paulista, SP, (22.4oS; 45.0oO). Images obtained from
OH and OI (557.7 nm) airglow emissions were used to investigate
the wave characteristics, using the keograma technique. The
results showed that 142 gravity wave events observed in the
airglow emission have the following characteristics: horizontal
wavelength between 50 and 500 km, observed period between 20 and
80 minutes, phase velocity between 40 and 100 m/s. Medium-scale
gravity wave propagation directions were analyzed for each season
of the year and presented the following propagation
characteristics: summer propagation to Northeast and Southeast,
autumn mainly propagation to Northwest, winter showed a
quasi-isotropic propagation and during spring the waves propagated
to Northeast and Southeast. A comparison of the propagation
directions between small and medium scale gravity wave was also
performed. The mainly propagation directions of small and
medium-scale gravity waves are similar for each season of the
year. This may indicate that the possible wave sources of
medium-scale gravity wave may be related to the same
meteorological phenomena that generate small-scale gravity waves
over Cachoeira Paulista, such as frontal systems and convective
systems.",
conference-location = "Buenos Aires, Argentina",
conference-year = "16-20 abr.",
language = "en",
urlaccessdate = "2025, Feb. 09"
}