Abstract Details
| Name: Muhammed Abdurahman K Affiliation: MES Ponnani College, University of Calicut Conference ID: ASI2018_1778 Title : Geoeffectiveness of Coronal Mass Ejections Authors and Co-Authors : *1. Muhammed Abdurahman K, *1. Sreelakshmi P, *2.Dr. Muhammed Aslam O.P *1.Department of Physics, MES Ponnani College, Ponnani South, Kerala, India *2.Department of Physics, AMU Aligarh, U.P, India Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : Coronal mass ejections (CMEs) consist of large structures containing plasma and magnetic fields that are expelled from the Sun into the heliosphere. CMEs remove built-up magnetic energy and plasma from the solar corona and they are responsible for the most extreme space weather effects at Earth. CMEs originating from close to the disk center significantly perturb the Earth’s environment and they directly impact the Earth, Such CMEs are termed as geoeffective and they are the major cause for the severe geomagnetic storms. Nine intense geomagnetic storm events (Disturbance storm time index, Dst < -180 nT) caused by CMEs, occurred during the period 2000–2016 are selected. The geomagnetic response of selected solar events are analyzed and compared, and identified several of their features during their near-Earth passage. Evaluated the hourly data of two geomagnetic indices, Dst, and AE, and the concurrent data of interplanetary plasma and field parameters. Recognized distinct features of these events and solar wind parameters, when the geomagnetic disturbance is at its peak. Also discuss the similarities and differences in the geoeffectiveness of the solar and interplanetary structures in the light of plasma and field variations and physical mechanism(s), which play crucial role in influencing the geomagnetic activity. |