| Name: | Anjali Agarwal |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2024_205 |
| Title : | Implications of Interplanetary Acceleration of CMEs on Their Radial Sizes at 1 AU |
| Authors : | Anjali Agarwal [1] and Wageesh Mishra [1] |
| Authors Affiliation: | [1] Indian Institute of Astrophysics, II Block, Koramangala, Bengaluru 560034, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | Coronal Mass Ejections (CMEs) are huge expulsions of magnetized plasma originating from the Sun, with the potential to induce various space weather effects. Therefore, accurately predicting their arrival time and radial sizes at Earth is crucial for assessing the potential time-window of geomagnetic impact. Despite significant advancements in CME research in recent years, precisely estimating their kinematics through remote observations remains a challenging. This challenge is primarily due to the influence of projection effects on the three-dimensional geometry of CMEs, their optically thin nature, and an incomplete understanding of the dominant forces acting on them at varying distances. Furthermore, utilizing remote observations of CMEs in proximity to the Sun, there have been limited efforts to estimate the radial sizes of Interplanetary CMEs (ICMEs) at different distances within the interplanetary medium. In our study, we aim to mitigate the impact of projection effects on a specific set of Earth-directed CMEs using GCS model. These selected CMEs exhibit a range of speeds and travel through a dynamically changing solar wind environment. To accomplish this, we use the derived three-dimensional kinematic properties of CMEs observed closer to the Sun as inputs for the Drag-Based Model (DBM). This approach enables us to estimate the accelerations experienced by CMEs throughout their journey from the Sun to Earth. We then compare the estimated radial sizes and arrival times of CMEs, derived from their three-dimensional kinematics, with in situ measurements. Our research underscores the importance of tracking CMEs beyond the existing field of view provided by coronagraphs, using observations from multiple vantage points offered by heliospheric imagers. |
