The existence of time-energy correlations in flare occurrence is still anopen and much debated problem. This study addresses the question whetherstatistically significant correlations are present between energies ofsuccessive flares as well as energies and waiting times. We analyze the GOEScatalog with a statistical approach based on the comparison of the real catalogwith a reshuffled one where energies are decorrelated. This analysis reducesthe effect of background activity and is able to reveal the role ofobscuration. We show the existence of non-trivial correlations between waitingtimes and energies, as well as between energies of subsequent flares. Moreprecisely, we find that flares close in time tend to have the second event withlarge energy. Moreover, after large flares the flaring rate significantlyincreases, together with the probability of other large flares. Results suggestthat correlations between energies and waiting times are a physical propertyand not an effect of obscuration. These findings could give importantinformation on the mechanisms for energy storage and release in the solarcorona.
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