Magnetic Structures and Giant Flares in HR1099
We describe results from the December 1989 multi-site continuous observing campaign (MUSICOS 89 with 17 telescopes around the globe) dedicated to the study of active structures and flares on the RS CVn system HR1099=V711 Tau. Two exceptional white-light flares were detected on 14 and 15 December with remarkable photometric and spectral signatures during rise and decay. Equivalent colours, temperature excesses, projected areas (0.55 and 0.89 solar disc areas), radiative and kinetic energy budgets were derived for the two white-light flares. At IAU Colloq. 153, we presented the relation between Doppler imaged spots, extended emission and these giant flares, and discussed them in the context of models of magnetic interconnection and filament energy storage between the stars.
KeywordsCoronal Mass Ejection Doppler Imaging Kinetic Energy Budget Extended Emission HR1099 Campaign
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