Premium
High‐Order Solar Migrating Tides Quench at SSW Onsets
Author(s) -
He Maosheng,
Forbes Jeffrey M.,
Chau Jorge L.,
Li Guozhu,
Wan Weixing,
Korotyshkin Dmitry V.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl086778
Subject(s) - harmonics , middle latitudes , ionosphere , atmospheric sciences , atmospheric tide , thermosphere , geology , environmental science , physics , meteorology , geophysics , quantum mechanics , voltage
Sudden stratospheric warming events (SSWs) are the most spectacular atmospheric vertical coupling processes, well‐known for being associated with diverse wave activities in the upper atmosphere and ionosphere. The first four solar tidal harmonics have been reported as being engaged. Here, combining mesospheric winds detected by three midlatitude radars, we demonstrate at least the first six harmonics that occurred during SSW 2018. Wave number diagnosis demonstrates that all six harmonics are dominated by migrating components. Wavelet analyses reveal that the fourth, fifth, and sixth harmonics quench after the SSW onset. The six harmonics and the quenching appear also in a statistical analysis based on near‐12‐year observations from one of the radars. We attribute the quenching to reversal of the background eastward wind.