Climatology of planetary wave type oscillations with periods of 2–20 days derived from O<sub>2</sub> atmospheric and OH(6-2) airglow observations at mid-latitude with SATI

Abstract

Abstract. The presence of planetary wave type oscillations at mid-latitudes in the mesosphere/lower thermosphere region has been investigated using airglow observations. The observations were taken with a Spectral Airglow Temperature Imager (SATI) installed at Sierra Nevada Observatory (37.06 • N, 3.38 • W) at 2900 m height. Airglow data of the column emission rate of the O 2 Atmospheric (0-1) band and of the OH Meinel (6-2) band and deduced rotational temperatures from 1998 to 2007 have been used in this study. From these observations a climatology of planetary wave type oscillations at this location is inferred. It has been found that the planetary wave type oscillations of 5-day period is predominant in our data throughout the year, with activity greater than 50% during March/April and October/November months. The planetary wave type oscillations of 2-day period is predominant during both solstices, being predominant during winter solstice in O 2 while a 10-day oscillation appears throughout the year with activity around 20% and with maximum activity during spring and autumn equinoxes. The 16-day oscillation has maximum occurrence during autumn-winter while its activity is almost disappeared during spring-summer. No clear seasonal dependence of the amplitude of the planetary wave type oscillations was observed in the cases considered in this study.The waves simultaneously detected in the rotational temperatures deduced from both OH and O 2 emissions usually Correspondence to: M. J. López-González (mariajose@iaa.es) show an upward energy propagation and are affected by dissipation processes.

Mesospheric OH layer altitude at midlatitudes: variability over the Sierra Nevada Observatory in Granada, Spain (37° N, 3° W)

“…There is a 1.3 % per year relative drift between SATI and SABER intensities, the SATI signal being relatively smaller with time, probably due to faster aging. The mean SABER and SATI temperature difference is 5.6 K, which is in agreement with previous results from López-González et al (2009). Temperature differences do not strongly depend on temperature, so the slope is close to unity.…”

“…These studies have focused on varied topics: analysis of the impact of atmospheric waves on regional and global scales, the detection of geo-hazards, the effect of sudden stratospheric warmings (SSWs), seasonal and interannual variations, external forcing response, longterm trends, cross-validation for satellite measurements, the detection of satellite drifts and the determination of OH radiative properties (e.g., López-González et al, 2009;Cho et al, 2010;Bittner et al, 2010;French and Mulligan, 2010; M. García-Comas et al: OH layer altitude over the OSN Offermann et al, 2010;Shepherd et al, 2010a, b;French and Klekociuk, 2011;García-Comas et al, 2012;Ammosov et al, 2014;Reisin et al, 2014;Liu et al, 2015;Wüst et al, 2017, to mention just a few. ).…”

Ionospheric Day-to-Day Variability Around the Whole Heliosphere Interval in 2008

“…It is also possible that the periodicity was the results of the nonlinear interaction of the variations of different periods, such as the 9-day and 13.5-day variations. They might also be related to the lower-atmospheric planetary waves that propagate upward to the mesosphere and lower-thermosphere region causing changes in the ionosphere (López-González et al, 2009). In fact, Liu et al (2010) showed, using model simulations, that stationary planetary waves can modify semidiurnal tides which, in turn, produce changes in the neutral-wind dynamo and introduce periodicities in the ionospheric peak density and total-electron content that have the same periods as those of the planetary waves.…”

Mesopause temperature perturbations caused by infrasonic waves as a potential indicator for the detection of tsunamis and other geo-hazards

“…These airglow derived temperatures have been used for example for studying planetary waves with periods from days to weeks (e.g. Sivjee et al, 1994;Espy et al, 1997;Takahashi et al, 2002;Buriti et al, 2005;Höppner and Bittner, 2007;López-González et al, 2009) as well as for investigating atmospheric gravity waves with periods of several hours down to about 8 min (e.g. Gavrilov et al, 2002;Reisin and Scheer, 2004).…”