Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/39328
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dc.contributor.authorOgawa, T.-
dc.contributor.authorArnold, N. F.-
dc.contributor.authorKirkwood, S.-
dc.contributor.authorNishitani, N.-
dc.contributor.authorLester, M.-
dc.date.accessioned2017-02-06T14:34:14Z-
dc.date.available2017-02-06T14:34:14Z-
dc.date.issued2003-04-10-
dc.identifier.citationAnnales Geophysicae, 2003, 21 (4), pp. 1047-1055 (9)en
dc.identifier.issn0992-7689-
dc.identifier.urihttp://www.ann-geophys.net/21/1047/2003/angeo-21-1047-2003.htmlen
dc.identifier.urihttp://hdl.handle.net/2381/39328-
dc.description.abstractPeculiar near range echoes observed in summer with the SuperDARN HF radar in Finland are presented. The echoes were detected at four frequencies of 9, 11, 13 and 15 MHz at slant ranges of 105–250 km for about 100 min. Interferometer measurements indicate that the echoes are returned from 80–100 km altitudes with elevation angles of 20◦–60◦ . Echo power (≤ 16 dB), Doppler velocity (between –30 and + 30 m s^−1 ) and spectral width (≤ 60 m s^−1 ) fluctuate with periods of several to 20 min, perhaps due to short–period atmospheric gravity waves. When the HF radar detected the echoes, a vertical incidence MST radar, located at Esrange in Sweden (650 km north of the HF radar site), observed polar mesosphere summer echoes (PMSE) at altitudes of 80– 90 km. This fact suggests that the near range HF echoes are PMSE at HF band, although both radars did not probe a common volume. With increasing radar frequency, HF echo ranges are closer to the radar site and echo power becomes weaker. Possible mechanisms to explain these features are discussed.en
dc.description.sponsorshipThe authors wish to thank the team of the Radio and Space Plasma Physics group at the University of Leicester who constructed, deployed and operated the CUTLASS HF radars. The ESRAD radar is jointly funded by the Swedish Space Corporation and the Swedish Research Council. N. F. Arnold was supported by an advanced fellowship from the UK Particle Physics and Astronomy Research Council and CUTLASS operations were funded by PPARC grant RP16021.en
dc.language.isoenen
dc.publisherEuropean Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)en
dc.rights© Author(s) 2003. This work is distributed under the Creative Commons Attribution 3.0 License.en
dc.subjectScience & Technologyen
dc.subjectPhysical Sciencesen
dc.subjectAstronomy & Astrophysicsen
dc.subjectGeosciences, Multidisciplinaryen
dc.subjectMeteorology & Atmospheric Sciencesen
dc.subjectGeologyen
dc.subjectASTRONOMY & ASTROPHYSICSen
dc.subjectGEOSCIENCES, MULTIDISCIPLINARYen
dc.subjectMETEOROLOGY & ATMOSPHERIC SCIENCESen
dc.subjectmeteorology and atmospheric dynamicsen
dc.subjectmiddle atmosphere dynamicsen
dc.subjectthermospheric dynamicsen
dc.subjectwaves and tidesen
dc.subjectinstruments and techniquesen
dc.subjectMETEOR ECHOESen
dc.subjectVHF RADARen
dc.subjectNETWORK OBSERVATIONSen
dc.subjectMESOPAUSE ECHOESen
dc.subjectPMSEen
dc.subjectSUPERDARNen
dc.subjectDYNASONDEen
dc.subjectDYNAMICSen
dc.subjectCAMPAIGNen
dc.subjectEISCATen
dc.titleFinland HF and Esrange MST radar observations of polar mesosphere summer echoesen
dc.typeJournal Articleen
dc.identifier.doi10.5194/angeo-21-1047-2003-
dc.identifier.eissn1432-0576-
dc.description.statusPeer-revieweden
dc.description.versionPublisher Versionen
dc.type.subtypeArticle;Journal-
pubs.organisational-group/Organisationen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomyen
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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