Abstract
Medium-scale travelling ionospheric disturbances (MSTID) is one of the most common ionospheric phenomena that generally induce the perturbations of ionospheric total electron content (TEC). Observation of MSTID at Low Latitude over Sumatra has been done by studying of TEC fluctuation associated with MSTID. In this paper, a short term observations of MSTID are provided by using Sumatran GPS Array (SUGAR). The two-dimensional maps of detrended TEC (DTEC) obtained from SUGAR have been used on May 16, 2004 investigations of medium-scale TID. The results show a propagation of MSTID in southeast-ward direction. Cross-correlating analysis of DTEC measurements between two receivers is used to obtain propagation parameters and found velocities of MSTID around 118 ms-1 without including relative movement GPS satellite and receiver (Doppler effect).
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