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Evidence for solar signals in the mesopause temperature variability?

Höppner, Kathrin und Bittner, Michael (2007) Evidence for solar signals in the mesopause temperature variability? Journal of Atmospheric and Solar-Terrestrial Physics, 69 (4-5), Seiten 431-448. DOI: 10.1016/j.jastp.2006.10.007. ISSN 1364-6826.

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Kurzfassung

Nocturnal temperatures are almost continuously derived from OH* (3,1) near-infrared emissions in the upper mesosphere (around 87 km) above Wuppertal, Germany (51°N, 7°E) from ground-based measurements since 1980. The time series analyzed covers the time interval from 1980 until 2005 and consists of 4628 well documented night mean temperature data. OH* temperature fluctuations on temporal scales of about 3–20 days are derived by removing seasonal and longer term trends from the data record by means of applying various spectral analysis techniques such as the harmonic analysis, maximum entropy method (MEM) and the wavelet transform, respectively. The residuals are found to reflect planetary wave activity. Spectral intensity of oscillations in the 3–20 days regime shows a longer term modulation peaking around 1981 and 1996, while minima are encountered around 1986 and 2005. Thus, no conclusive correlation with the solar F10.7 cm flux is found. Reasonable agreement of planetary wave activity with the general solar bipolar magnetic field (22-year Hale cycle) is found instead. Further agreement is found with the variations of the length of the day (ΔLOD) implying that the internal terrestrial magnetic field is superimposed by the solar magnetic field (Hale cycle) causing modulations of the total magnetic field in the Earth’s interior and which leads—in turn—to a modulation of the electromagnetic coupling of angular momentum between the Earth’s core and the Earth’s mantle. As a result the Earth’s rotation period Ω—and thus the activity of planetary waves—should be modulated with the solar magnetic flux, e.g. the quasi-22-year Hale cycle. Planetary wave activity is further found to be modulated by a quasi-2-year oscillation. The modulation is strongest around 1994/1995 and lowest around 1988 and 2004, respectively. It is found that wave activity is mostly enhanced when the wind direction of the mean zonal wind of the equatorial quasi-biennial oscillation (QBO) reverses from westerly to easterly.

Dokumentart:Zeitschriftenbeitrag
Titel:Evidence for solar signals in the mesopause temperature variability?
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Höppner, Kathrinkathrin.hoeppner@dlr.de
Bittner, Michaelmichael.bittner@dlr.de
Datum:2007
Erschienen in:Journal of Atmospheric and Solar-Terrestrial Physics
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:69
DOI :10.1016/j.jastp.2006.10.007
Seitenbereich:Seiten 431-448
ISSN:1364-6826
Status:veröffentlicht
Stichwörter:Hydroxyl airglow; Mesopause temperatures; Planetary waves; Solar cycle influence; QBO; Hale cycle
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Datenprodukte für Klima- und Atmosphärenanwendungen (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Klima- und Atmosphärenprodukte
Hinterlegt von: Dr. Kathrin Höppner
Hinterlegt am:10 Apr 2007
Letzte Änderung:22 Apr 2013 14:33

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