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		<citationkey>BilibioWrFiScPaTa:2018:MeGrWa</citationkey>
		<title>Medium-scale gravity waves observed in the airglow over Cachoeira Paulista</title>
		<year>2018</year>
		<secondarytype>PRE CI</secondarytype>
		<author>Bilibio, Anderson Vestena,</author>
		<author>Wrasse, Cristiano Max,</author>
		<author>Figueiredo, Cosme Alexandre Oliveira Barros,</author>
		<author>Schuch, Nelson Jorge,</author>
		<author>Paulino, I.,</author>
		<author>Takahashi, Hisao,</author>
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		<group>DIDAE-CGCEA-INPE-MCTIC-GOV-BR</group>
		<group>CRCRS-COCRE-INPE-MCTIC-GOV-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal de Campina Grande (UFCG)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress>anderson.bilibio@inpe.br</electronicmailaddress>
		<electronicmailaddress>cristiano.wrasse@inpe.br</electronicmailaddress>
		<electronicmailaddress>cosme.figueiredo@inpe.br</electronicmailaddress>
		<electronicmailaddress>nelson.schuch@inpe.br</electronicmailaddress>
		<conferencename>Latin American Conference on Space Geophysics, 11 (COLAGE)</conferencename>
		<conferencelocation>Buenos Aires, Argentina</conferencelocation>
		<date>16-20 abr.</date>
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		<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.</abstract>
		<area>CEA</area>
		<language>en</language>
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