부산대학교 도서관

Scintillations on gigahertz (GHz) radio signal are observed during daytime due to electron density irregularities in the equatorial E-region. The occurrence of these irregularities in presence of sporadic E (Es) can result in GHz scintillations during daytime. This study focuses on the investigation of Es in the equatorial region using Global Navigation Satellite System (GNSS) signal transmissions received on the ground and in space. We bring two datasets to bear; (1) GNSS based radio occultation (RO) technique, which provides an ideal limb-viewing geometry from space for studying the feature of Es, and (2) GPS ground-based station. These two datasets provide a unique opportunity to study the feature and structure of Es. The occurrence of daytime GHz Scintillation (DGS) present from GPS scintillation/TEC data recorded by the GSV4004 receiver at Universiti Kebangsaan Malaysia (UKM) (2.55°N, 101.46°E; dip latitude (Φ) = 5.78°S) station in Malaysia. The results obtained from these two datasets show that (1) Es structures existed over the UKM station as denoted by the RO observations, and (2) the appearance of Es is associated with the occurrence of DGS.