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Semi‐Monthly Lunar Tide Oscillation of f oF2 in Equatorial Ionization Anomaly (EIA) Crests During 2014–2015 SSW
Author(s) -
Tang Qiong,
Zhou Chen,
Li ZiShen,
Liu Yi,
Chen GuanYi
Publication year - 2021
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja028708
Subject(s) - atmospheric sciences , thermosphere , equator , geology , anomaly (physics) , atmospheric tide , northern hemisphere , southern hemisphere , latitude , climatology , mesosphere , ionosphere , environmental science , stratosphere , geophysics , physics , geodesy , condensed matter physics
We investigate the ionospheric responses to the 2014–2015 sudden stratospheric warming (SSW) event in winter and summer hemisphere by using ionosondes distributed in Equatorial Ionization Anomaly (EIA) crests. Daily mean value of f oF2 at each station shows obvious semimonthly lunar tide (∼14.5‐day period) modulation from lower to higher latitude in both hemispheres during SSW period. Besides, lunar tide modulation in summer hemisphere is later than that in winter hemisphere, which can be explained by the planetary wave penetrating across the equator from winter to summer hemisphere. In addition, lunar semidiurnal tide extracted from f oF2 presents evident enhancement after warming onset. Our results demonstrate the quasi 16‐day periodic oscillations in F region of EIA crests are caused by the enhanced lunar tide in dynamo wind of mesosphere and lower thermosphere region, which is due to the disturbances in the zonal mean wind distribution in connection with SSW.