Fig. 4
From: Three-dimensional electron density along the WSA and MSNA latitudes probed by FORMOSAT-3/COSMIC
Upper panels are the altitude variations of the F3/C N within 30–60° N geographic at various global fixed local times in the 4 months. Bottom panels are extracted the 250-km altitude N at 45° N geographic. Black circle-dots and circle-crosses and arrows denote the longitudinal equatorward and poleward maximum effect and vertical effect W at 55° N geographic at 250-km altitude, respectively. White dots are the longitudinal maximum N M at 250-km altitude in the J-month. The two eastward phase shifts 91 and 121 m/s are computed by averaging three-time-point fitting shift by 1 point in 135° E–115° W and 50° W–100° E latitudinal zone, respectively