Long-term variations of the mesospheric wind field at mid-latitudes

dc.bibliographicCitation.firstPage1779
dc.bibliographicCitation.issue8eng
dc.bibliographicCitation.lastPage1790
dc.bibliographicCitation.volume25
dc.contributor.authorKeuer, D.
dc.contributor.authorHoffmann, P.
dc.contributor.authorSinger, W.
dc.contributor.authorBremer, J.
dc.date.accessioned2018-03-09T10:43:58Z
dc.date.available2019-06-28T12:38:30Z
dc.date.issued2007
dc.description.abstractContinuous MF radar observations at the station Juliusruh (54.6° N; 13.4° E) have been analysed for the time interval between 1990 and 2005, to obtain information about solar activity-induced variations, as well as long-term trends in the mesospheric wind field. Using monthly median values of the zonal and the meridional prevailing wind components, as well as of the amplitude of the semidiurnal tide, regression analyses have been carried out with a dependence on solar activity and time. The solar activity causes a significant amplification of the zonal winds during summer (increasing easterly winds) and winter (increasing westerly winds). The meridional wind component is positively correlated with the solar activity during summer but during winter the correlation is very small and non significant. Also, the solar influence upon the amplitude of the semidiurnal tidal component is relatively small (in dependence on height partly positive and partly negative) and mostly non-significant. The derived trends in the zonal wind component during summer are below an altitude of about 83 km negative and above this height positive. During the winter months the trends are nearly opposite compared with the trends in summer (transition height near 86 km). The trends in the meridional wind components are below about 85 km positive in summer (significant) and near zero (nonsignificant) in winter; above this height during both seasons negative trends have been detected. The trends in the semidiurnal tidal amplitude are at all heights positive, but only partly significant. The detected trends and solar cycle dependencies are compared with other experimental results and model calculations. There is no full agreement between the different results, probably caused by different measuring techniques and evaluation methods used. Also, different heights and observation periods investigated may contribute to the detected differences.eng
dc.description.versionpublishedVersioneng
dc.formatapplication/pdf
dc.identifier.urihttps://doi.org/10.34657/1587
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/4063
dc.language.isoengeng
dc.publisherMünchen : European Geopyhsical Unioneng
dc.relation.doihttps://doi.org/10.5194/angeo-25-1779-2007
dc.relation.ispartofseriesAnnales Geophysicae, Volume 25, Issue 8, Page 1779-1790eng
dc.rights.licenseCC BY 3.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/eng
dc.subjectamplificationeng
dc.subjectlatitudeeng
dc.subjectmeridional circulationeng
dc.subjectmesosphereeng
dc.subjectregression analysiseng
dc.subjectseasonal variationeng
dc.subjectsemidiurnal tideeng
dc.subjectsolar activityeng
dc.subjectwind fieldeng
dc.subjectzonal windeng
dc.subject.ddc530eng
dc.titleLong-term variations of the mesospheric wind field at mid-latitudeseng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleAnnales Geophysicaeeng
tib.accessRightsopenAccesseng
wgl.contributorIAPeng
wgl.subjectPhysikeng
wgl.subjectGeowissenschafteneng
wgl.typeZeitschriftenartikeleng
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