Observation of a 27-day solar signature in noctilucent cloud altitude

Autor(en): Koehnke, Merlin C.
von Savigny, Christian
Robert, Charles E.
Stichwörter: Astronomy & Astrophysics; Engineering; Engineering, Aerospace; Geology; Geosciences, Multidisciplinary; ICE; Meteorology & Atmospheric Sciences; Noctilucent clouds; OZONE; POLAR MESOSPHERIC CLOUDS; Polar summer mesopause; Remote sensing; SCIAMACHY; Solar variability; TEMPERATURE; VARIABILITY
Erscheinungsdatum: 2018
Herausgeber: ELSEVIER SCI LTD
Journal: ADVANCES IN SPACE RESEARCH
Volumen: 61
Ausgabe: 10
Startseite: 2531
Seitenende: 2539
Zusammenfassung: 
Previous studies have identified solar 27-day signatures in several parameters in the Mesosphere/Lower thermosphere region, including temperature and Noctilucent cloud (NLC) occurrence frequency. In this study we report on a solar 27-day signature in NLC altitude with peak-to-peak variations of about 400 m. We use SCIAMACHY limb-scatter observations from 2002 to 2012 to detect NLCs. The superposed epoch analysis method is applied to extract solar 27-day signatures. A 27-day signature in NLC altitude can be identified in both hemispheres in the SCIAMACHY dataset, but the signature is more pronounced in the northern hemisphere. The solar signature in NLC altitude is found to be in phase with solar activity and temperature for latitudes greater than or similar to 70 degrees N. We provide a qualitative explanation for the positive correlation between solar activity and NLC altitude based on published model simulations. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.
ISSN: 02731177
DOI: 10.1016/j.asr.2018.02.035

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