Speaker
Description
The association between solar flares and coronal mass ejections (CMEs) plays a critical role in understanding solar eruptive phenomena and their impact on space weather. This work presents a comprehensive statistical analysis of 49 solar radio bursts detected by the POEMAS (POlarization Emission of Millimeter Activity at the Sun) instrument, which operates at 45 and 90 GHz at the CASLEO Observatory (Argentina), covering the period from 2011 to 2013. Among these events, 27 were associated with halo or partial-halo coronal mass ejections (CMEs). The primary focus of the study is to investigate the correlation between millimeter-wave flare emissions and the occurrence of associated CMEs, with particular attention to their potential geoeffectiveness. Additionally, we calculate the spectral index of the flares based on the flux ratio between 45 and 90 GHz, exploring possible correlations with the GOES flare class, event intensity, and CME association. The heliographic position of the active region responsible for each flare is examined as a key parameter to assess CME propagation direction. This analysis aims to identify diagnostic trends of flares with millimeter-wave signatures linked to high-energy electron acceleration and accompanied by CMEs. The study also investigates how the heliographic location of active regions, CME types (halo, partial halo, or absent), and the spectral characteristics of the flares interrelate, providing new insights into particle acceleration and transport mechanisms in eruptive solar events. The results contribute to a better understanding of the physical conditions driving solar eruptions and may support improvements in space weather forecasting models, particularly in predicting high-frequency radio emissions and the occurrence of extreme solar events.
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