Investigating the relationship between EUV waves, CMEs and Type II Radio Bursts
Dr. Aarti Fulara
Date & Time :
Solar eruptive events like flares, Coronal Mass Ejections (CMEs), and prominence eruptions release a huge amount of energy. The profound effect of such explosive processes is not only confined in and around the parent active region, but also causes disturbances in other parts of the corona and interplanetary medium in the forms of fast magnetosonic waves and shocks. The existence of these coronal waves has been well established by type II radio bursts . It has been often thought that EUV waves and type IIs are two observational aspects of a single coronal shock wave. However, the physical inconsistency found between them hampers understanding of their respective (or common) natures. Knowing the uncertainties in identifying true wave components from observations and measuring their speeds, we re-examine the speeds of EUV waves reported in previous literature to be compared with those of the type II radio bursts. In addition, EUV waves are often seen closely linked with CMEs. However, the spatial relationship of EUV waves with CMEs is still not completely understood. CMEs are best observed in off-limb coronagraphic observations that hides the inner corona details where EUV waves are actually observed. In addition, EUV imagers have a limited field of view that fails to capture EUV waves in higher corona where CMEs are observed. Therefore, observations of EUV waves occurring close to the limb allows us to link these low coronal disturbances to CMEs.
Thus, I will talk about the spatial correlation between EUV wave fronts and CME leading fronts in 4 limb CMEs observed in inner corona, by presenting composite observations and discuss about the nature of the CME leading front inferred from these observations.
About Speaker :
Dr. Aarti Fulara is a Post Doctoral Fellow at ARIES.