Terdiurnal signatures in sporadic E layers at midlatitudes

[摘要] Global Positioning System radio occultation measurements by the FORMOsaSATellite mission-3/Constellation Observing System for Meteorology,Ionosphere and Climate satellites were used to analyse the behaviour of thesignature of the terdiurnal tide in sporadic E (E_S) layers atmidlatitudes (43–63° N). According to theory, theoccurrence of E_S is expected when the vertical zonal wind shear, whichis mainly owing to solar tides, is negative. 4 yr means, based on3-monthly running mean zonal means from December 2006–November 2010, wereconstructed for the terdiurnal oscillation in the occurrence frequency ofE_S. Comparison of the results with VHF meteor radar observations of theterdiurnal tide and the 8 h oscillation in the vertical zonal wind shearat Collm, Germany (51.3° N, 13° E) shows a clearcorrespondence between the 8 h in E_S and in wind shear signature.

[学科分类] 电子、光学、磁材料