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Small-scale ionospheric disturbances may cause severe radio scintillations of\udsignals transmitted from global navigation satellite systems (GNSSs).\udConsequently, small-scale plasma irregularities may heavily degrade the\udperformance of current GNSSs such as GPS, GLONASS or Galileo. This paper\udpresents analysis results obtained primarily from two high-rate GNSS receiver\udstations designed and operated by the German Aerospace Center (DLR) in\udcooperation with Bahir Dar University (BDU) at 11.6° N,\ud37.4° E. Both receivers collect raw data sampled at up to 50 Hz, from\udwhich characteristic scintillation parameters such as the S4 index are\uddeduced.  \udThis paper gives a first overview of the measurement set-up and the observed\udscintillation events over Bahir Dar in 2015. Both stations are located close\udto one another and aligned in an east–west, direction which allows us to\udestimate the zonal drift velocity and spatial dimension of equatorial\udionospheric plasma irregularities. Therefore, the lag times of moving\udelectron density irregularities and scintillation patterns are derived by\udapplying cross-correlation analysis to high-rate measurements of the slant\udtotal electron content (sTEC) along radio links between a GPS satellite and\udboth receivers and to the associated signal power,\udrespectively. Finally, the drift velocity is derived from the estimated lag\udtime, taking into account the geometric constellation of both receiving\udantennas and the observed GPS satellites

Scintillation measurements at Bahir Dar during the high solar activity phase of solar cycle 24