Variations of upper atmospheric high-order solar tidal harmonics during sudden stratospheric warming 2018
- 1Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany (he@iap-kborn.de)
- 2Ann \& H.J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, USA
- 3Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
- 4Kazan Federal University, Kazan, Russia
Solar tides are the most predictably-occurring waves in the upper atmosphere. Although the dynamical theory can be dated back to Laplace in the 16th century, in the upper atmosphere tides were rarely studied observationally until satellites and ground-based radars became common. To date, studies have mainly focused on low-order harmonics. Here, we combine mesospheric wind observations from three longitudinal sectors to investigate high-order harmonics. Results illustrate that the first six harmonics appear in early 2018, all of which are dominated by sum-synchronous components. Among these harmonics, the 6hr, 4.8hr, and 4hr components weaken at the sudden stratospheric warming (SSW) onset. The weakening could be explained in terms of variations in the background zonal wind.
How to cite: He, M., Forbes, J., Chau, J., Li, G., Wan, W., and Korotyshkin, D.: Variations of upper atmospheric high-order solar tidal harmonics during sudden stratospheric warming 2018, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4062, https://doi.org/10.5194/egusphere-egu2020-4062, 2020
