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ISSN  2096-3955

CN  10-1502/P

Citation: Wen Yi, XiangHui Xue, JinSong Chen, TingDi Chen, Na Li, 2019: Quasi-90-day oscillation observed in the MLT region at low latitudes from the Kunming meteor radar and SABER, Earth and Planetary Physics, 3, 136-146. doi: 10.26464/epp2019013

2019, 3(2): 136-146. doi: 10.26464/epp2019013


Quasi-90-day oscillation observed in the MLT region at low latitudes from the Kunming meteor radar and SABER


Chinese Academy of Sciences Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei 230026, China


Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China


Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China


National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China

Corresponding author: XiangHui Xue,

Received Date: 2018-11-08
Web Publishing Date: 2019-03-01

Observations of a quasi-90-day oscillation in the mesosphere and lower thermosphere (MLT) region from April 2011 to December 2014 are presented in this study. There is clear evidence of a quasi-90-day oscillation in temperatures obtained from the Kunming meteor radar (25.6°N, 103.8°E) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), as well as in wind observed by the Kunming meteor radar. The quasi-90-day oscillation appears to be a prominent feature in the temperatures and meridional wind tides and presents quite regular cycles that occur approximately twice per year. The amplitudes and phases of the quasi-90-day oscillation in the SABER temperature show a feature similar to that of upward-propagated diurnal tides, which have a vertical wavelength of ~20 km above 70 km. In the lower atmosphere, a similar 90-day variability is presented in the surface latent heat flux and correlates with the temperature in the MLT region. Similar to the quasi-90-day oscillation in temperature, a 90-day variability of ozone (O3) is also present in the MLT region and is considered to be driven by a similar variability in the upwardly-propagated diurnal tides generated in the lower atmosphere. Moreover, the 90-day variability in the absorption of ultraviolet (UV) radiation by daytime O3 in the MLT region is an in situ source of the quasi-90-day oscillation in the MLT temperature.

Key words: quasi-90-day oscillation, meteor radar temperatures, SABER temperatures, tides, latent heat release, SABER ozone

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Quasi-90-day oscillation observed in the MLT region at low latitudes from the Kunming meteor radar and SABER

Wen Yi, XiangHui Xue, JinSong Chen, TingDi Chen, Na Li