Dynamic Coronal Heating by Magnetic Flux Interaction

Physics

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Scientific paper

The elements of a Converging Flux Model for heating X-ray bright points are here put forward which also accounts for the cancelling magnetic features that are usually observed to be present in the photosphere below bright points and the jets that are observed with Yohkoh. The model has three phases: a preinteraction phase in which two opposite polarity photospheric fragments are unconnected magnetically; an interaction phase when the fragments reconnect in the corona and create the bright point and x-ray jet; a cancellation phase when reconnection in the photosphere produces the cancelling magnetic feature. An analytical model is presented together with preliminary results of a numerical experiment and a three-dimensional modelling of particular bright points observed by the NIXT telescope. Furthermore, dynamic reconnection driven by footpoint motions in a bright point may represent an elementary heating event that could be heating coronal loops and coronal holes and not just bright points.

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