Abstract Details
| Name: Devojyoti Kansabanik Affiliation: University Corporation for Atmospheric Research Conference ID: ASI2025_6840 Title : Remote sensing the magnetic field of coronal mass ejections in the heliosphere using radio observations Authors and Co-Authors : Devojyoti Kansabanik Abstract Type : Award Talk Abstract Category : Plenary Abstract : Space weather (SpWx) refers to the plasma environment in near-Earth space and the heliosphere, primarily shaped by coronal mass ejections (CMEs)—massive plasma ejections from the Sun. The geo-effectiveness of CMEs depends largely on their magnetic field strength and structure, which evolve as they interact with solar structures, other CMEs, and the solar wind. Predicting CME arrival times and the critical southward (BZ) magnetic component at 1 AU remains challenging due to these changes. Accurate measurements of CME magnetic fields are essential for improving SpWx forecasting. Radio observations across MHz to GHz frequencies provide a promising approach for remotely sensing these fields. Gyrosynchrotron (GS) emission imaging can trace magnetic fields from the lower corona to ~10 solar radii, while Faraday rotation (FR) complements this by probing fields in the outer corona and heliosphere. Together, these techniques enable a comprehensive understanding of CME magnetic field evolution. This talk will discuss recent advances in developing optimal observing strategies using next-generation radio telescopes like the MWA, ASKAP, MeerKAT, NenuFAR, etc., and the challenges of calibrating diverse datasets across wide spectral ranges. These efforts aim to provide homogeneous observables for constraining CME magnetic field models from the corona throughout the inner heliosphere and enhancing SpWx forecasting capabilities. |