Investigation of two coronal mass ejections from circular ribbon source region:Origin, Sun-Earth propagation and Geoeffectiveness

Abstract In this article, we compare the properties of two coronal mass ejections (CMEs) that show similar source region characteristics but different evolutionary behaviors in later phases. We discuss events terms their near-Sun characteristics, interplanetary evolution and geoeffectiveness. carefully analyzed initiation propagation parameters these to establish precise CME-interplanetary CME (ICME) connection near-Earth consequences. The first event is associated with poor geomagnetic storm disturbance index (Dst ≈-20 nT) while second an intense DST ≈-119 nT. configuration sunspots active regions are observed by Helioseismic Magnetic Imager (HMI). For imaging, rely on data obtained from Atmospheric Imaging Assembly (AIA) board Solar Dynamics Observatory (SDO) H α filtergrams Tower Telescope at Aryabhatta Research Institute Observational Sciences (ARIES). both CMEs, flux rope eruptions triggered flares intensities (≈M1). At solar eruptions,we a circular ribbon flare (CRF) for cases, suggesting fan-spine magnetic corona. multi-channel SDO observations confirm eruptive subsequent CMEs were intimately related filament eruption. Within Large Angle Spectrometric Coronograph (LASCO) field view (FOV) thetwo propagated linear speeds 671 631 km s −1 , respectively. These tracked up Earth Terrestrial Relations (STEREO) instruments. find guided large-scale configuration, along such as CME-CME interactions, played important roles deciding medium subsequently