Sensitivity of equatorial mesopause temperatures to the 27-day solar cycle
Article first published online: 2 NOV 2012
©2012. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 39, Issue 21, November 2012
How to Cite
2012), Sensitivity of equatorial mesopause temperatures to the 27-day solar cycle, Geophys. Res. Lett., 39, L21804, doi:10.1029/2012GL053563., , , , and (
- Issue published online: 2 NOV 2012
- Article first published online: 2 NOV 2012
- Manuscript Accepted: 1 OCT 2012
- Manuscript Revised: 21 SEP 2012
- Manuscript Received: 15 AUG 2012
- mesopause temperature;
- satellite remote sensing;
- solar variability
 Night-time observations of OH(3–1) rotational temperatures with SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) on Envisat are used to study the sensitivity of equatorial mesopause temperatures to the 27-day solar forcing. Fourier and cross-correlation analysis are first used to demonstrate the presence of a solar-driven 27-day cycle in OH rotational temperatures. The temperature sensitivity to solar forcing is quantitatively evaluated based on a superposed epoch analysis that also demonstrates that the solar signal in the OH temperature time series is significant at the 99.9 % confidence level. The most remarkable result is that the temperature sensitivity to solar forcing in terms of the 27-day solar cycle (βF10.7= 2.46 (±0.93) K/(100 sfu)) agrees within uncertainties with the majority of published sensitivity values in terms of the 11-year solar cycle. This implies that the same underlying physical mechanism drives the mesopause temperature response to solar variability at both the 27-day and the 11-year time scale.