COMPARISON OF RADIO-QUIET AND RADIO-LOUD FAST-WIDE CORONAL MASS EJECTIONS IN SOLAR CYCLE 24

Abstract

CMEs are complex phenomena associated with solar activity. RQ CMEs lack type II radio bursts in the metric and DH wave lengths,whereas,RL CMEs are associated with metric or DH type II bursts.This thesis focuses on comparing the properties of radio-quiet (RQ) and radio-loud (RL) FW Coronal Mass Ejections (CMEs) during Solar Cycle 24 (2008-2019 ),Using data from multi-instrument and multi-spacecraft sources such as Solar Heliospheric Observatory (SOHO), Solar Terrestrial Relations Observatory (STEREO), and Wind spacecraft. The study begins with a 115 Fast Wide (FW) CMEs, characterized by speeds (V ≥900 km/s) and angular width (W ≥ 600 ), observed during Solar Cycle 24. By utilizing data from LASCO/SOHO, SECCHI/STEREO, and wind/WAVES instruments, we identified 58 RQ CMEs and 57 RL CMEs.The RL CMEs had an average speed of (1415 km/s) compared to (1145 km/s) RQ CMEs.Moreover, RL CMEs also have more acceleration (+34 m/s2) than RQ( +19 m/s2) CMEs. The average width of the RL (3310),CMEs is much larger than the average width of RQ (2000) CMEs. We also found that 38% of RQ CMEs and 28% of RL CMEs come from the NW quadrant, while 19% of RQ CMEs and 30% of RL CMEs come from the NE quadrant.The fraction of full halo CMEs(82.5% ) was largest for the RL CMEs,but smaller for RQ(21%) CMEs. RL CMEs are associated with stronger flares (80% X and M class), whereas RQ CMEs are linked to weaker flares (65% C class and 32.5% M class). RL CMEs are more energetic than RQ CMEs.