Analysing Impact of Major Solar Flares on Ionospheric Total Electron Content using NavIC Signals

A Navigation with Indian Constellation (NavIC) re-ceiver granted by Space Applications Centre, Ahmed-abad, has been set up at SVNIT, Surat. In the present article, an effort has been made to study ionosphere response with NavIC signals during three consecutive major ‘M’ class and ‘C’ class solar flare events which took place on 22, 23 and 24 July 2016. Empirical mode decomposition (EMD) and variable mode decomposition (VMD) have been used to de-compose total electron content (TEC). Pearson corre-lation coefficients are synthesized and processed for determining the effect of solar flares on TEC data during these events. VMD gives better results com-pared to EMD for determining TEC fluctuations dur-ing the occurrences of solar flare events. Automatic ionospheric scintillation model (RTISM) based on Hilbert–Huang transform is applied to determine au-tomatic threshold using Neyman Pearson detector, probability of detection and probability of false alarm using TEC.