Asian Journal of Research and Reviews in Physics 4(2): 6-20, 2021; Article no.AJR2P.66815 ISSN: 2582-5992 Instantaneous Ionospheric Scintillation Mapping over the East African Region by use of GPS Derived Amplitude Scintillation Proxy Emirant Bertillas Amabayo 1,2 ˚ , Geoffrey Andima 1 and Richard Cliffe Ssenyunzi 1 1 Department of Physics, Busitema University, Tororo, Uganda. 2 Department of Physics, Mbarara University of Science and Technology, Mbarara, Uganda. Authors’ contributions This work was carried out in collaboration among all authors. GA and EBA designed the study, performed the analysis, wrote the protocol and wrote the first draft of the manuscript. RCS managed the literature searches. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJR2P/2021/v4i230138 Editor(s): (1) Prof. Shi-Hai Dong, National Polytechnic Institute, Mexico. Reviewers: (1) Surendra Sunda GNSS, Airports Authority of India, India. (2) Volkan AKGUL, Zonguldak Bulent Ecevit University, Turkey. (3) Hai Wang, Beijing University of Posts and Telecommunications, China. Complete Peer review History: http://www.sdiarticle4.com/review-history/66815 Received 02 February 2021 Accepted 08 April 2021 Original Research Article Published 21 April 2021 ABSTRACT Ionospheric scintillation activity over the East African region is often monitored using measurements from the SCIntillation Network Decision Aid (SCINDA) receivers. Many of the SCINDA receivers over East Africa are currently not archiving data and therefore a large part of the region remain un sampled. We investigated the possibility to use dual frequency receivers of the Global Navigation Satellite System (GNSS) network for scintillation mapping. A proxy for amplitude scintillation was first derived by scaling the rate of change of total electron content index (ROTI). The proxy was validated against S4 derived from nearly collocated SCINDA receivers over the region. A good correlation was observed between the proxy and S4. The proxy was then used to map the occurrence of amplitude scintillation over East Africa based on semivariogram modeling and Kriging interpolation technique. The results indicate that the S4 values had a good positive correlation with *Corresponding author: E-mail: emirant.amabayo@gmail.com;