Influence of annual atmospheric tide asymmetry on annual anomalies of the ionospheric mean state

作者：ZhiPeng Ren,WeiXing Wan,JianGang Xiong,Xing Li

摘要：Through respectively adding June tide and December tide at the low boundary of the GCITEM-IGGCAS model (Global CoupledIonosphere–Thermosphere–Electrodynamics Model, Institute of Geology and Geophysics, Chinese Academy of Sciences), we simulate theinfluence of atmospheric tide on the annual anomalies of the zonal mean state of the ionospheric electron density, and report that thetidal influence varies with latitude, altitude, and solar activity level. Compared with the density driven by the December tide, the June tidemainly increases lower ionospheric electron densities (below roughly the height of 200 km), and decreases electron densities in thehigher ionosphere (above the height of 200 km). In the low-latitude ionosphere, tides affect the equatorial ionization anomaly structure(EIA) in the relative difference of electron density, which suggests that tides affect the equatorial vertical E×B plasma drifts. Although thetide-driven annual anomalies do not vary significantly with the solar flux level in the lower ionosphere, in the higher ionosphere theannual anomalies generally decrease with solar activity.

發文機構：Key Laboratory of Earth and Planetary Physics Innovation Academy for Earth Science Beijing National Observatory of Space Environment College of Earth and Planetary Sciences School of Space and Environment Key Laboratory of Space Environment Monitoring and Information Processing

關鍵詞：ionosphericannualanomaliesatmospherictideionosphere–atmospherecoupling

分類號： P73[天文地球—海洋科學]