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VLF (very low frequency) can be used to probe lower atmospheric activities. To detect lower atmospheric activities, two types of VLF receiver were developed in this project. The first type is called SID (sudden ionospheric disturbances) receiver which is used to detect the solar flares activities that affect communication systems. The second one is called natural radio receiver which is used to detect...
We have studied the variations of TEC at quasi-conjugate points using data obtained from GPS receiver at Syowa station, Antarctica (SYOG) (GC: -69.00?? S, 39.58?? E; CGM: -66.08??S, 71.65 E??), and A??rholt station (ARHO), Iceland (high Arctic region) (GC: 66.19?? N, 342.89?? E; CGM: 66.37??S, 71.48 E??) for a period in 2007, during the minimum phase of solar cycle 23. The GPS measurements of IGS...
Using Vertical Total Electron Content (VTEC) data derived from the Malaysian Real Time Kinematic network (MyRTKnet), we present a simple technique to estimate the medium scale-travelling ionospheric disturbance (MSTID) at low latitudes. Medium-scale travelling ionospheric disturbances are wave-like perturbations of the ionospheric plasma with wavelengths of several hundred kilometres and velocities...
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 Global Positioning System (GPS) has become a powerful tool for ionospheric studies. The parameter of the ionosphere that produces most of the effects on radio signals is the total electron content (TEC). This paper reports on the variability of the total electron content (TEC) during the North Sumatra earthquake of 26 December 2004 with a magnitude of 9.3 Richter scale. TEC is measured 7 days...
This paper describes an analysis of ionospheric models compared with real data during the occurrence of travelling ionospheric disturbances. GPS data was taken from Parit Raja Station (1deg 52' N, 103deg 06' E) in Southern Malaysia. Comparison was made from collected data during the geomagnetic quiet and storm days. Ionospheric models i.e. IRI2001, NeQuick and real data as in IONEX format were used...
The Global Positioning System (GPS) has become a powerful tool for ionospheric studies. The accuracy of coordination data for the Global Positioning System (GPS) receiver by the GPS monitoring station should be increased. The accuracy can be increased by determining the sources of the disturbances that have been produced by all of ionospheric effects. The parameter of ionosphere that produces most...
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