Evidence for Small-Scale Filamentation and Dynamics in the Solar Corona

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Observations with the Transition Region and Coronal Explorer (TRACE) have revealed that the solar corona is both highly dynamic and highly filamented. In this talk I will discuss how dynamics and filamentation play an important role in explaining some of the observational properties of the Sun's atmosphere. TRACE observations have shown, for example, that many relatively cool ( ˜1 MK), long-lived active region loops have density and temperature profiles that are difficult to reconcile with static models. By modeling these loops as a sequence of impulsively heated filaments, in contrast, it is possible to account for the high densities, flat temperature profiles, and the temporal evolution of these structures. A similar approach to modeling the evolution of flare emission yields much better agreement with observation than treating the flare as a single loop.

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