<?xml version="1.0" encoding="ISO-8859-1"?>
<metadatalist>
	<metadata ReferenceType="Conference Proceedings">
		<site>mtc-m21c.sid.inpe.br 806</site>
		<holdercode>{isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}</holdercode>
		<identifier>8JMKD3MGP3W34R/44CT8SP</identifier>
		<repository>sid.inpe.br/mtc-m21c/2021/03.24.11.32</repository>
		<lastupdate>2021:03.24.11.32.07 urlib.net/www/2017/11.22.19.04 simone</lastupdate>
		<metadatarepository>sid.inpe.br/mtc-m21c/2021/03.24.11.32.07</metadatarepository>
		<metadatalastupdate>2022:04.03.22.39.44 sid.inpe.br/bibdigital@80/2006/04.07.15.50 administrator</metadatalastupdate>
		<secondarykey>INPE--PRE/</secondarykey>
		<citationkey>NyassorWGTBKBBFB:2021:CoGrWa</citationkey>
		<title>Concentric Gravity waves observed by OH airglow over São João do Cariri</title>
		<year>2021</year>
		<secondarytype>PRE CN</secondarytype>
		<author>Nyassor, Prosper Kwamla,</author>
		<author>Wrasse, Cristiano Max,</author>
		<author>Gobbi, Delano,</author>
		<author>Takahashi, Hisao,</author>
		<author>Bageston, José Valentin,</author>
		<author>Kleber, P. N.,</author>
		<author>Batista, Paulo Prado,</author>
		<author>Barros, Diego Prado,</author>
		<author>Figueiredo, Cosme Alexandre Oliveira Barros,</author>
		<author>Buriti, R. A.,</author>
		<resumeid></resumeid>
		<resumeid></resumeid>
		<resumeid>8JMKD3MGP5W/3C9JGTE</resumeid>
		<resumeid>8JMKD3MGP5W/3C9JHCM</resumeid>
		<resumeid></resumeid>
		<resumeid></resumeid>
		<resumeid>8JMKD3MGP5W/3C9JJ3H</resumeid>
		<group>DICEP-CGCE-INPE-MCTI-GOV-BR</group>
		<group>DICEP-CGCE-INPE-MCTI-GOV-BR</group>
		<group>DICEP-CGCE-INPE-MCTI-GOV-BR</group>
		<group>DICEP-CGCE-INPE-MCTI-GOV-BR</group>
		<group>COESU-CGGO-INPE-MCTI-GOV-BR</group>
		<group></group>
		<group>DIHPA-CGCE-INPE-MCTI-GOV-BR</group>
		<group>DIHPA-CGCE-INPE-MCTI-GOV-BR</group>
		<group>DICEP-CGCE-INPE-MCTI-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>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>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal de Campina Grande (UFCG)</affiliation>
		<electronicmailaddress>pnyassor@gmail.com</electronicmailaddress>
		<electronicmailaddress>cristiano.wrasse@inpe.br</electronicmailaddress>
		<electronicmailaddress>delano.gobbi@uol.com.br</electronicmailaddress>
		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>jose.bageston@inpe.br</electronicmailaddress>
		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>paulopradobatista@yahoo.com</electronicmailaddress>
		<electronicmailaddress>dprado114@gmail.com</electronicmailaddress>
		<electronicmailaddress>anagetinga@hotmail.com</electronicmailaddress>
		<conferencename>Simpósio Brasileiro de Geofísica Espacial e Aeronomia, 8 (SBGEA)</conferencename>
		<conferencelocation>Online</conferencelocation>
		<date>22-26 mar.</date>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
		<abstract>Observation of concentric/circular gravity waves (CGWs) in the OH airglow emission over the Brazilian equatorial region. An all-sky imager located at Sao Joao do Cariri [7.39&#9702;S, 36.53&#9702;W] was used in the acquisition of the images. Using 20 years of observational data (between 1998 and 2018), 1052 nights of airglow observations were taken. However, only 5 CGW(s) cases were found with small-scale wave characteristics. The CGW(s) events showed horizontal wavelengths between 25 and 31km, horizontal phase speed between 42 and 75m/s and periods ranging from 7 to 11 minutes. Most of the CGW structures were well defined with coherent wave patterns expanding concentrically with all observed cases having semi-circle or arc-like shapes. The occurrence of CGWs was found to coincide mostly with the seasons of strong tropospheric convective activity as well as low background winds. This suggested a low level of wave breaking or critical level absorption/filtering/reflection, allowing the CGWs to propagate up to the mesosphere and lower thermosphere (MLT) region.</abstract>
		<area>CEA</area>
		<language>en</language>
		<usergroup>simone</usergroup>
		<readergroup>administrator</readergroup>
		<readergroup>simone</readergroup>
		<visibility>shown</visibility>
		<documentstage>not transferred</documentstage>
		<nexthigherunit>8JMKD3MGPCW/46KTFK8</nexthigherunit>
		<nexthigherunit>8JMKD3MGPCW/46KUBT5</nexthigherunit>
		<hostcollection>urlib.net/www/2017/11.22.19.04</hostcollection>
		<username>simone</username>
		<agreement>agreement.html .htaccess .htaccess2</agreement>
		<lasthostcollection>urlib.net/www/2017/11.22.19.04</lasthostcollection>
	</metadata>
</metadatalist>