Occurrence frequencies of polar mesosphere summer echoes observed at 69 N during a full solar cycle

dc.bibliographicCitation.firstPage327eng
dc.bibliographicCitation.volume11eng
dc.contributor.authorLatteck, R.
dc.contributor.authorBremer, J.
dc.date.accessioned2020-09-06T07:58:45Z
dc.date.available2020-09-06T07:58:45Z
dc.date.issued2013
dc.description.abstractPolar mesosphere summer echoes (PMSE) are strong enhancements of received signal power at very high radar frequencies occurring at altitudes between about 80 and 95 km at polar latitudes during summer. PMSE are caused by inhomogeneities in the electron density of the radar Bragg scale within the plasma of the cold summer mesopause region in the presence of negatively charged ice particles. Thus the occurrence of PMSE contains information about mesospheric temperature and water vapour content but also depends on the ionisation due to solar wave radiation and precipitating high energetic particles. Continuous and homogeneous observations of PMSE have been done on the North-Norwegian island Andøya (69.3 N, 16.0 E) from 1999 until 2008 using the ALWIN VHF radar at 53.5 MHz. In 2009 the Leibniz-Institute of Atmospheric Physics in Kühlungsborn, Germany (IAP) started the installation of the Middle Atmosphere Alomar Radar System (MAARSY) at the same location. The observation of mesospheric echoes could be continued in spring 2010 starting with an initial stage of expansion of MAARSY and is carried out with the completed installation of the radar since May 2011. Since both the ALWIN radar and MAARSY are calibrated, the received echo strength of PMSE from 14 yr of mesospheric observations could be converted to absolute signal power. Occurrence frequencies based on different common thresholds of PMSE echo strength were used for investigations of the solar and geomagnetic control of the PMSE as well as of possible long-term changes. The PMSE are positively correlated with the solar Lyman α radiation and the geomagnetic activity. The occurrence frequencies of the PMSE show slightly positive trends but with marginal significance levels.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://doi.org/10.34657/4222
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/5593
dc.language.isoengeng
dc.publisherGöttingen : Copernicuseng
dc.relation.doihttps://doi.org/10.5194/ars-11-327-2013
dc.relation.ispartofseriesAdvances in Radio Science 11 (2013)eng
dc.relation.issn1684-9965
dc.rights.licenseCC BY 3.0 Unportedeng
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/eng
dc.subjectAtmospheric physicseng
dc.subjectEnergetic particleseng
dc.subjectGeomagnetic activitieseng
dc.subjectMesospheric temperatureeng
dc.subjectNegatively chargedeng
dc.subjectPolar mesosphere summer echoeseng
dc.subjectSignificance levelseng
dc.subjectStrong enhancementeng
dc.subjectGeomagnetismeng
dc.subjectGeophysicseng
dc.subjectRadar systemseng
dc.subjectSolar energyeng
dc.subject.ddc550eng
dc.titleOccurrence frequencies of polar mesosphere summer echoes observed at 69 N during a full solar cycleeng
dc.typearticleeng
dc.typeTexteng
dcterms.bibliographicCitation.journalTitleAdvances in Radio Scienceeng
tib.accessRightsopenAccesseng
wgl.contributorIAPeng
wgl.subjectPhysikeng
wgl.typeZeitschriftenartikeleng
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