THE IONOSPHERIC TOTAL ELECTRON CONTENT VARIATION IN THE BEGINNING OF SOLAR ACTIVITY INCREASE CYCLE 24

Abstract

This paper presents an analysis of ionospheric TEC (Total Electron Content) variation in the begining of solar activity periode 2011, based on GPS observation by using GISTM (GPS Ionospheric Scintillation and TEC Monitoring) Pontianak (-0.06, 109.4). The results of the investigation obtained that the highest VTEC occurred in equinox months, March and September and formed asymmetric increased VTEC where the September equinox had stronger intensity and extended through October and November. The periodesity analysis using the Morlet wavelet obtained a period of 24 hours (1 day). The one day period (diurnal) appeared in every month from January to December, where strong signals occurred in March, September and October (equinox months). While weak signals occurred in January and June during wet and dry season respectively. The distribution of TEC variation index showed tend to increase after 6 a.m but the difference between dry season, wet seasons and equinox did not obvious. However, the tendency of TEC variation index from January to December tend to increase with a coefficient R=0.14.