The receivers are part of the GPS-aided geo-stationary earth orbit augmented navigation program over the Indian region. The study covers a wide area, spanning from 65°E to 100°E in geographic longitude and from 5°N to 40°N in geographic latitude, with a 2° × 2° grid separation. To generate the one-minute spatial TEC maps, the researchers use the Kriging method. Additionally, the study generates ROTI and S4 maps at 5-minute intervals. The researchers evaluate the performance of the regional TEC maps during a severe geomagnetic storm condition. During the St. Patrick's storm from 15 to 20 March 2015, the researchers analyze the patterns of equatorial ionization anomaly (EIA) TEC structures using the generated TEC maps. The proposed TEC maps show the northern crest of EIA features with their latitudinal extent and TEC strength.The Kriging method used in this study identifies suppressed and downshifted EIA features on 18 March 2015. Furthermore, the researchers analyze the movement of plasma bubbles over Indian latitudes during the transition period of a geomagnetic storm on 17 March 2015.In summary, this study focuses on creating regional maps of ionospheric parameters over the Indian region using GPS data and the Kriging method. The researchers investigate ionospheric structures and their behavior during severe geomagnetic storm conditions.