Longitudinal variations of ionospheric response to high speed solar wind driven geomagnetic storms

High Speed Solar Winds (HSSW) ($\sim$700km/sec near earth) ejected from coronal hole interacts with relatively slow speed ambient wind stream at Corotating Interaction Region (CIR). The region co-rotates with the Sun for a period of ~27 days. Thus the geomagnetic storms induced from HSSW are normally repetitive in nature. The CIR storm is weaker than Coronal Mass Ejection (CME) storms in terms of effects on earth's magnetic field, induced ring current. CIR storms are frequent during decaying solar activity periods. The present paper inspects the effects of CIR driven geomagnetic storm on different latitudes in the northern hemisphere from Indian longitudes ($\sim$75°E geographic) and US-Pacific longitudes ($\sim$120°W geographic). The latitudinal variations are observed from geomagnetic equator to polar region. CIR storms during August 31 - September 6, 2016 and October 24-31, 2016 are chosen for this study. The periods are characterized by presence of multiple CIR driven geomagnetic storms. Enhancements in Total Electron Content (TEC) are observed during August 31 - September 6, 2016 from Indian longitude sector. The day of maximum TEC enhancements at different latitudes are not same which indicates the temporal delay of effects of thermospheric plasma transport at different latitudes. The effects of Auroral electrojet and polar region Joule heating on the global circulation of neutral wind are inspected, Correlations between Prompt Penetration Electric Field (PPEF) and the changes in TEC at low latitudes are observed and the latitudinal extents of PPEF in the midlatitude region are also inspected.